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1. Indenting fractal-edged elastic materials

Author

Costa, D. F. S., Pontes, J. H. M, Ferreira, W. P., de Sousa, J. S., and Oliveira, C. L. N.

Subjects
Physics - Computational Physics
Abstract

Surface roughness plays a crucial role in the accuracy of indentation experiments used to measure the elastic properties of materials. In this study, we present a computational analysis of how surface roughness, represented explicitly by fractal geometry, influences the mechanical properties of soft materials. We model two-dimensional elastic samples with a Koch fractal bottom surface, grown upward or downward to the fourth generation, referred to as fractal \textit{down} and fractal \textit{up}, respectively. The elastodynamics equations are solved numerically while a rigid punch indents the elastic sample from the top surface. By applying the Hertz model for mechanical contact, we determine the Young's modulus of the materials. Our findings reveal that fractal surfaces, especially those with dimensions comparable to the sample size, can significantly alter experimental measurement outcomes. In particular, the roughness of the substrate profoundly affects the measured elastic properties, as seen in scenarios involving cell elasticity. For instance, in the \textit{down} fractal scenario, reductions in the measured elastic modulus range from 2\% to 4\%, while increases reach up to 40\% in the \textit{up} fractal scenario. These results underscore the importance of incorporating fractal geometry into the design and analysis of indentation experiments. This approach could significantly enhance our understanding and application of material characterization and mechanical testing, leading to more accurate and reliable results.

Published
2024

2. Energy levels and Aharonov-Bohm oscillations in twisted bilayer graphene quantum dots and rings

Author

Bandeira, N. S., Chaves, Andrey, de Castro, L. V., Filho, R. N. Costa, Mirzakhani, M., Peeters, F. M., and da Costa, D. R.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We present a systematic study of the energy levels of twisted bilayer graphene (tBLG) quantum dots (QD) and rings (QR) under an external perpendicular magnetic field. The confinement structures are modeled by a circular dot-like- and ring-like-shaped site-dependent staggered potential, which prevents edge effects and leads to an energy gap between the electron and hole states. Results are obtained within the tight-binding model with interlayer hopping parameters defined by the Slater-Koster form for different interlayer twist angles $\theta$. Our findings show that, for $\theta$ around 0$^\circ$ or $60^\circ$, the energy spectra exhibit features resulting from the interplay between characteristics of the AA and AB/BA stacking orders that compose the moir\'e pattern of such tBLG, while the low-energy levels are shown to be nearly independent on the rotation angle for $10^\circ\lesssim \theta\lesssim 50^\circ$. In the absence of a magnetic field, the energy levels of the QR scale with its width $W$ according to a power law $W^{-\alpha}$, whose exponent $1 \lessapprox\alpha\lessapprox 2$ depends on the twist angle. Most interestingly, the lowest energy states of tBLG QRs oscillate as a function of its average radius, with the oscillation period matching half of the moir\'e period. In the presence of an intense magnetic field, the lowest energy levels for the tBLG QDs and QRs match almost perfectly, regardless of whether the external radius of the quantum confinement structure is smaller or on the order of the moir\'e period, which is due to the interplay of the trigonal warping effect and the preferential localization of the eigenstates. Our results reveal relevant information about the moir\'e pattern in tBLG and its role in charge particle confinement., Comment: 16 pages, 12 figures

Published
2024

3. On the impact of initial conditions in the forecast of Hurricane Leslie extratropical transition

Author

López-Reyes, Mauricio, González-Alemán, J. J., Sastre, M., Insua-Costa, D., Bolgiani, P., and Martín, M. L.

Subjects
Physics - Atmospheric and Oceanic Physics
Abstract

Hurricane Leslie (2018) was a non-tropical system that lasted for a long time undergoing several transitions between tropical and extratropical states. Its trajectory was highly uncertain and difficult to predict. Here the extratropical transition of Leslie is simulated using the Model for Prediction Across Scales (MPAS) with two different sets of initial conditions (IC): the operational analysis of the Integrate Forecast System (IFS) and the Global Forecast System (GFS). Discrepancies in Leslie position are found in the IC patterns, and in the intensity and amplitude of the dorsal-trough system in which Leslie is found. Differences are identified both in the geopotential height at 300 hPa and the geopotential thickness. Potential temperature in the dynamic tropopause shows a broader, more intense trough displaced western when using the IC-IFS. The IC-IFS simulation shows lesser trajectory errors but wind speed overestimation than the IC-GFS one. The complex situation of the extratropical transition, where Leslie interacts with a trough, increases the uncertainty associated with the intensification process. The disparities observed in the simulations are attributed to inaccuracies in generating the ICs. Both ICs generate different atmospheric configurations when propagated in time. Results suggest that during an extratropical transition in a highly baroclinic atmosphere, the IFS model's data assimilation method produced a more precise analysis than GFS due to the greater number of observations assimilated by the IFS, the greater spatial resolution of the model and the continuous adjustment of the simulations with the field of observations.

Published
2024
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4. Electronic band evolution between Lieb and kagome nanoribbons

Author

Uchôa, E. S., Lima, W. P., Sena, S. H. R., Chaves, A. J. C., Pereira Jr., J. M., and da Costa, D. R.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We investigate the electronic properties of nanoribbons made out of monolayer Lieb, transition, and kagome lattices using the tight-binding model with a generic Hamiltonian. It allows us to map the evolutionary stages of the interconvertibility process between Lieb and kagome nanoribbons by means of only one control parameter. Results for the energy spectra, the density of states, and spatial probability density distributions are discussed for nanoribbons with three types of edges: straight, bearded, and asymmetric. We explore for different nanoribbon terminations: (i) the semiconductor-metallic transition due to the interconvertibility of the Lieb and kagome lattices, (ii) the effect of both nanoribbon width and inclusion of the next-nearest-neighbor hopping term on the degeneracy of the quasi-flat states, (iii) the behavior of the energy gap versus the nanoribbon width, (iv) the existence and evolution of edge states, and (v) the nodal spatial distributions of the total probability densities of the non-dispersive states., Comment: 21 pages, 12 figures

Published
2024

5. Reconfigurable classifier based on spin torque driven magnetization switching in electrically connected magnetic tunnel junctions

Author

Lopez, A., Costa, D., Bohnert, T., Freitas, P. P., Ferreira, R., Barbero, I., Camarero, J., Leon, C., Grollier, J., and Romera, M.

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

A promising branch of neuromorphic computing aims to perform cognitive operations in hardware leveraging the physics of efficient and well-established nano-devices. In this work, we present a reconfigurable classifier based on a network of electrically connected magnetic tunnel junctions that categorizes information encoded in the amplitude of input currents through the spin torque driven magnetization switching output configuration. The network can be trained to classify new data by adjusting additional programming currents applied selectively to the junctions. We experimentally demonstrate that a network composed of three magnetic tunnel junctions can learn to classify spoken vowels with a recognition rate that surpasses the performance of software multilayer neural networks with the same number of trained parameters in this task. These results, obtained with the same nano-devices and working principle employed in industrial spin-transfer torque magnetic random-access memories (STT-MRAM), constitute an important step towards the development of large-scale neuromorphic networks based on well-established technology., Comment: To be published in Physical Review Applied. 13 pages, 4 figures

Published
2024

6. Properties of electrons accelerated by the Ganymede-magnetosphere interaction: survey of Juno high-latitude observations

Author

Rabia, J., Hue, V., Andre, N., Nenon, Q., Szalay, J. R., Allegrini, F., Sulaiman, A. H., Louis, C. K., Greathouse, T. K., Sarkango, Y., Santos-Costa, D., Blanc, M., Penou, E., Louarn, P., Ebert, R. W., Gladstone, G. R., Mura, A., Connerney, J. E. P., and Bolton, S. J.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The encounter between the Jovian co-rotating plasma and Ganymede gives rise to electromagnetic waves that propagate along the magnetic field lines and accelerate particles by resonant or non-resonant wave-particle interaction. They ultimately precipitate into Jupiter's atmosphere and trigger auroral emissions. In this study, we use Juno/JADE, Juno/UVS data, and magnetic field line tracing to characterize the properties of electrons accelerated by the Ganymede-magnetosphere interaction in the far-field region. We show that the precipitating energy flux exhibits an exponential decay as a function of downtail distance from the moon, with an e-folding value of 29{\deg}, consistent with previous UV observations from the Hubble Space Telescope (HST). We characterize the electron energy distributions and show that two distributions exist. Electrons creating the Main Alfv\'en Wing (MAW) spot and the auroral tail always have broadband distribution and a mean characteristic energy of 2.2 keV while in the region connected to the Transhemispheric Electron Beam (TEB) spot the electrons are distributed non-monotonically, with a higher characteristic energy above 10 keV. Based on the observation of bidirectional electron beams, we suggest that Juno was located within the acceleration region during the 11 observations reported. We thus estimate that the acceleration region is extended, at least, between an altitude of 0.5 and 1.3 Jupiter radius above the 1-bar surface. Finally, we estimate the size of the interaction region in the Ganymede orbital plane using far-field measurements. These observations provide important insights for the study of particle acceleration processes involved in moon-magnetosphere interactions., Comment: Accepted for publication in JGR: Space Physics

Published
2024

8. Valley-selective confinement of excitons in transition metal dichalcogenides with inhomogeneous magnetic fields

Author

Chaves, A. J., da Costa, D. R., Peeters, F. M., and Peres, Nuno M. R.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Magnetized ferromagnetic disks or wires support strong inhomogeneous fields in their borders. Such magnetic fields create an effective potential, due to Zeeman and diamagnetic contributions, that can localize charge carriers. For the case of two-dimensional transition metal dichalcogenides, this potential can valley-localize excitons due to the Zeeman term, which breaks the valley symmetry. We show that the diamagnetic term is negligible when compared to the Zeeman term for monolayers of transition metal dichalcogenides. The latter is responsible for trapping excitons near the magnetized structure border with valley-dependent characteristics, in which, for one of the valleys, the exciton is confined inside the disk, while for the other, it is outside. This spatial valley separation of exciton can be probed by circularly polarized light, and moreover, we show that the inhomogeneous magnetic field magnitude, the dielectric environment, and the magnetized structure parameters can tailor the spatial separation of the exciton wavefunctions., Comment: 10 pages, 5 figures

Published
2024

9. Moir\'e excitons in biased twisted bilayer graphene under pressure

Author

Duarte, V. G. M., da Costa, D. R., Peres, N. M. R., Teles, L. K., and Chaves, A. J.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Using the tight-binding model, we report a gap opening in the energy spectrum of the twisted bilayer graphene under the application of pressure, that can be further amplified by the presence of a perpendicular bias voltage. The valley edges are located along the K-Gamma path of the superlattice Brillouin Zone, with the bandgap reaching values up to 200 meV in the single-particle picture. Employing the formalism of the semiconductor Bloch equations, we observe an enhancement of the bandgap due to the electron-electron interaction, with a renormalization of the bandgap of about 160 meV. From the solution of the corresponding Bethe-Salpeter equation, we show that this system supports highly anisotropic bright excitons whose electrons and holes are strongly hybridized between the adjacent layers., Comment: 6 pages, 3 figures, supplemental material available from the authors

Published
2023

11. Wave packet scattering in porous planar semiconductor channel

Author

Lopes, D. S., de Sousa, A. A., de Sousa, J. S., da Costa, D. R., and Pereira, T. A. S.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, 81U08, I.6.6
Abstract

In this work, we investigate the dynamics of the wave packet traveling through a porous semiconductor channel, with the defects being simulated by a disordered scattering region produced by obstruction potentials. The theoretical framework is based on the $split-operator$ technique to solve the time-dependent Schr$\"o$dinger equation within the effective mass approximation. In our simulation, we consider the semiconductor channel made by InGaAs with a width of 100 angstrom, growth on an InAlAs substrate, and the porous ones with circular symmetry and different densities. The results for the current probability density and reflection, and transmission coefficients are analyzed for different initial values of the kinetic energy of the Gaussian wave packet, disordered pore densities, and pore randomness., Comment: The title of the work will have to be changed and the results will have to be more widely discussed

Published
2023

12. Magnetism in twisted triangular bilayer graphene quantum dots

Author

Mirzakhani, M., Park, H. C., Peeters, F. M., and da Costa, D. R.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Using a tight-binding model along with the mean-field Hubbard method, we investigate the effect of twisting angle on the magnetic properties of twisted bilayer graphene (tBLG) quantum dots (QDs) with triangular shape and zigzag edges. We consider such QDs in two configurations: when their initial untwisted structure is a perfect AA- or AB-stacked BLG, referred to as AA- or AB-like dots. We find that AA-like dots exhibit an antiferromagnetic spin polarization for small twist angles, which transits to a ferromagnetic spin polarization beyond a critical twisting angle $\theta_c$. Our analysis shows that $\theta_c$ decreases as the dot size increases, obeying a criterion, according to which once the maximum energy difference between electron and hole edge states (in the single-particle picture) is less than $(U / \gamma_0)\, t_0$, the spin-polarized energy levels are aligned ferromagnetically [$U$ is the Hubbard parameter and $\gamma_0$ ($t_0$) the graphene intralayer (interlayer) hopping]. Unlike AA-like dots, AB-like dots exhibit finite magnetization for any twist angle. Furthermore, in the ferromagnetic polarization state, the ground net spin for both dot configurations agrees with prediction from Lieb's theorem.

Published
2023

14. Trion clustering structure and binding energy in 2D semiconductor materials: Faddeev equations approach

Author

Mohseni, K., Hadizadeh, M. R., Frederico, T., da Costa, D. R., and Chaves, A. J.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

In this work, we develop the basic formalism to study trions in semiconductor layered materials using the Faddeev equations in momentum space for three different particles lying in two dimensions. We solve the trion Faddeev coupled integral equations for both short-range one-term separable Yamaguchi potential and Rytova-Keldysh (RK) interaction applied to the MoS$_2$ layer. We devise two distinct regularization methods to overcome the challenge posed by the repulsive electron-electron RK potential in the numerical solution of the Faddeev equations in momentum space. The first method regulates the repulsive interaction in the infrared region, while the second regulates it in the ultraviolet region. By extrapolating the trion energy to the situation without screening, the two methods gave consistent results for the MoS$_2$ layer with a trion binding energy of $-49.5(1)$~meV for the exciton energy of $-753.3$~meV. We analyzed the trion structure for the RK and Yamaguchi potentials in detail, showing their overall similarities and the dominant cluster structure, where the strongly bound exciton is weakly bound to an electron. We found that this property is manifested in the dominance of two of the Faddeev components over the one where the hole is a spectator of the interacting electron pair., Comment: 16 pages, 11 figues, 8 tables

Published
2022
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16. Three-boson stability for boosted interactions towards the zero-range limit

Author

Mohseni, K., Chaves, A. J., da Costa, D. R., Frederico, T., and Hadizadeh, M. R.

Subjects
Nuclear Theory, Physics - Computational Physics
Abstract

We study the three-boson bound-state mass and wave functions for ground and excited states within the three-body relativistic framework with Kamada and Gl\"ocke boosted potentials in the limit of a zero-range interaction. We adopt a nonrelativistic short-range separable potential, with Yamaguchi and Gaussian form factors, and drive them towards the zero-range limit by letting the form factors' momentum scales go to large values while keeping the two-body binding fixed. We show that the three-boson relativistic masses and wave functions are model-independent towards the zero-range limit, and the Thomas collapse is avoided, while the nonrelativistic limit kept the Efimov effect. Furthermore, the stability in the zero-range limit is a result of the reduction of boosted potential with the increase of the virtual pair center of mass momentum within the three-boson system. Finally, we compare the present results with Light-Front and Euclidean calculations.

Published
2021
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17. Current knowledge and practice of Candida auris screening in France: A nationwide survey from the French Society of Medical Mycology (SFMM)

Author

Guitard, J., Bellanger, A.P., Dorin, J., Cassaing, S., Capitaine, A., Gabriel, F., Nicolas, M., Coron, N., Penn, P., Moniot, M., Quinio, D., Ranque, S., Sasso, M., Lepape, P., Dannaoui, E., Brun, S., Lacroix, C., Cornu, M., Debourgogne, A., Durieux, M.F., Laurent, G., Bru, V., Bourgeois, N., Brunet, K., Chouaki, T., Huguenin, A., Hasseine, L., Maubon, D., Gangneux, J.P., Desbois-Nogard, N., Houze, S., Dalle, F., Bougnoux, M.E., Alanio, A., Costa, D., Botterel, F., and Hennequin, C.

Published
2024
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20. Zitterbewegung of moir\'e excitons in twisted MoS$_2$/WSe$_2$ hetero-bilayers

Author

Lavor, I. R., da Costa, D. R., Covaci, L., Milošević, M. V., Peeters, F. M., and Chaves, A.

Subjects
Condensed Matter - Other Condensed Matter, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The moir\'e pattern observed in stacked non-commensurate crystal lattices, such as hetero-bilayers of transition metal dichalcogenides, produces a periodic modulation of their bandgap. Excitons subjected to this potential landscape exhibit a band structure that gives rise to a quasi-particle dubbed moir\'e exciton. In the case of MoS$_2$/WSe$_2$ hetero-bilayers, the moir\'e trapping potential has honeycomb symmetry and, consequently, the moir\'e exciton band structure is the same as that of a Dirac-Weyl fermion, whose mass can be further tuned down to zero with a perpendicularly applied field. Here we show that, analogously to other Dirac-like particles, moir\'e exciton exhibits a trembling motion, also known as zitterbewegung, whose long timescales are compatible with current experimental techniques for exciton dynamics. This promotes the study of the dynamics of moir\'e excitons in van der Waals heterostructures as an advantageous solid-state platform to probe zitterbewegung, broadly tunable by gating and inter-layer twist angle., Comment: https://journals.aps.org/prl/accepted/ea07cYf6O1518a78f1ac7684907511e93e68803ff

Published
2021
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21. Isolated and hybrid bilayer graphene rings

Author

Mirzakhani, M., da Costa, D. R., and Peeters, F. M.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Using the continuum model, we investigate the electronic properties of two types of bilayer graphene (BLG) quantum ring (QR) geometries: (i) an isolated BLG QR and (ii) a monolayer graphene (MLG) with a QR put on top of an infinite graphene sheet (hybrid BLG QR). Solving the Dirac-Weyl equation in the presence of a perpendicular magnetic field and applying the infinite-mass boundary condition at the ring boundaries, we obtain analytical results for the energy levels and corresponding wave spinors for both structures. In the case of isolated BLG QR, we observe a sizeable and magnetically tunable band gap which agrees with the tight-binding transport simulations. Our analytical results also show the intervalley symmetry $ E^K_e (m) = -E^{K'}_h(m) $ between the electron (e) and hole (h) states ($ m $ being the angular momentum quantum number) for the energy spectrum of the isolated BLG QR. The presence of interface boundary in a hybrid BLG QR modifies drastically the energy levels as compared to that of an isolated BLG QR. Its energy levels are tunable from MLG dot, to isolated BLG QR, and to MLG Landau energy levels as magnetic field is varied. Our predictions can be verified experimentally using different techniques such as by magnetotransport measurements.

Published
2021
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22. Signatures of sub-band excitons in few-layer black phosphorus

Author

Chaves, A., Sousa, G. O., Khaliji, K., da Costa, D. R., Farias, G. A., and Low, Tony

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Recent experimental measurements of light absorption in few-layer black phosphorus (BP) reveal a series of high and sharp peaks, interspersed by pairs of lower and broader features. Here, we propose a theoretical model for these excitonic states in few-layer black phosphorus (BP) within a continuum approach for the in-plane degrees of freedom and a tight-binding approximation that accounts for inter-layer couplings. This yields excitonic transitions between different combinations of the sub-bands created by the coupled BP layers, which leads to a series of high and low oscillator strength excitonic states, consistent with the experimentally observed bright and dark exciton peaks, respectively. The main characteristics of such sub-band exciton states, as well as the possibility to control their energies and oscillator strengths via applied electric and magnetic fields, are discussed, towards a full understanding of the excitonic spectrum of few-layer BP and its tunability., Comment: to appear in Phys. Rev. B

Published
2021
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25. Stark shift of excitons and trions in two-dimensional materials

Author

Cavalcante, L. S. R., da Costa, D. R., Farias, G. A., Reichman, D. R., and Chaves, A.

Subjects
Condensed Matter - Materials Science
Abstract

The effect of an external in-plane electric field on neutral and charged exciton states in two-dimensional (2D) materials is theoretically investigated. These states are argued to be strongly bound, so that electron-hole dissociation is not observed up to high electric field intensities. Trions in the anisotropic case of monolayer phosphorene are demonstrated to especially robust under electric fields, so that fields as high as 100 kV/cm yield no significant effect on the trion binding energy or probability density distribution. Polarizabilities of excitons are obtained from the parabolicity of numerically calculated Stark shifts. For trions, a fourth order Stark shift is observed, which enables the experimental verification of hyperpolarizability in 2D materials, as observed in the highly excited states of the Rydberg series of atoms and ions., Comment: 7 pages, 4 figures, 3 tables

Published
2021
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27. Polyethylene Identification in ocean water samples by means of 50 keV energy electron beam

Author

Adlish, J. I., Costa, D., Mainardi, E., Neuhold, P., Surrente, R., and Tagliapietra, L. J.

Subjects
Physics - Instrumentation and Detectors, Physics - Atmospheric and Oceanic Physics, 65C20, F.2.1
Abstract

The study presented hereafter shows a new methodology to reveal traces of polyethylene (the most common microplastic particles, known as a structure of C_2 H_4) in a sample of ocean water by the irradiation of a 50 keV, 1 uA electron beam. This is performed by analyzing the photon (produced by the electrons in water ) fluxes and spectra (i.e. fluxes as a function of photon energy) at different types of contaminated water with an adequate device and in particular looking at the peculiar interactions of electrons/photons with the potential abnormal atomic hydrogen (H), oxygen (O), carbon (C), phosphorus (P) compositions present in the water, as a function of living and not living organic organisms with a PO4 group RNA/DNA strands in a cluster configuration through a volumetric cells grid., Comment: 34 pages, 33 figures

Published
2020
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28. Electronic and transport properties of anisotropic semiconductor quantum wires

Author

Cunha, S. M., da Costa, D. R., Felix, L. C., Chaves, Andrey, and Pereira Jr, J. Milton

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Within the effective-mass approximation, we theoretically investigated the electronic and transport properties of 2D semiconductor quantum wires (QWs) with anisotropic effective masses and different orientations with respect to the anisotropic axis. The energy levels in the absence and presence of an external magnetic field are analytically calculated, showing: (i) a strong dependence on the spacing of energy levels related to the alignment QW angle and the anisotropy axis; and (ii) for non-null magnetic field, the quantum Hall edge states are significantly affected by the edge orientation. Moreover, by means of the split-operator technique, we analyzed the time evolution of wavepackets in straight and V-shaped anisotropic QWs and compared the transmission probabilities with those of isotropic systems. In the anisotropic case we found damped oscillations in the average values of velocity in both x and y directions for a symmetric Gaussian wavepacket propagating along a straight wide QW, with the oscillation being more evident as the non-collinearity between the group velocity and momentum vectors increases., Comment: 12 pages, 11 figures

Published
2020
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29. Current modulation in graphene p-n junctions with external fields

Author

Araújo, F. R. V., da Costa, D. R., Nascimento, A. C. S., and Pereira Jr, J. M.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

In this work we describe a proposal for a graphene-based nanostructure that modulates electric current even in the absence of a gap in the band structure. The device consists of a graphene p-n junction that acts as a Veselago lens that focuses ballistic electrons on the output lead. Applying external (electric and magnetic) fields changes the position of the output focus, reducing the transmission. Such device can be applied to low power field effect transistors, which can benefit from graphene's high electronic mobility.

Published
2020
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30. Application of Virtual Element Method for Plane Stress–Plane Strain Problems

Author

Dissanayake, Lahiru N., Costa, D. S. T., Wijesundara, K. K., di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Dissanayake, Ranjith, editor, Mendis, Priyan, editor, Weerasekera, Kolita, editor, De Silva, Sudhira, editor, Fernando, Shiromal, editor, and Konthesingha, Chaminda, editor

Published
2023
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32. Level of Cognitive Biases of Representativeness and Confirmation in Psychology Students of Three Bío-Bío Universities

Author

Castro M., Alexandra, Hernández A., Zabrina, Riquelme M., Elisa, Ossa C., Carlos, Aedo S., Jaime, Da Costa D., Silvia, and Páez R., Darío

Abstract

Cognitive biases are unreasonable ways of making decisions, often in a one-sided way. The objective of this research was to describe the level of representativeness and confirmation biases in Chilean psychology students, in order to know how this phenomenon occurs. The participants were 198 psychology students from three universities in southern Chile. The instrument was based on two cognitive tasks derived from Kanheman and Tversky. The data were analyzed through descriptive statistics and mean differences. The results indicate a high level of biases in the groups of students, in the two tasks evaluated; the representativeness bias presents differences among universities only in sub-task 1, as well as in task 2, related to confirmation bias. Likewise, there are differences in representation bias according to age and sex. The need to strengthen reasoning skills in the initial training of future psychologists, in order to improve skills related to decision making in the professional field is concluded.

Published
2019

34. Effect of zitterbewegung on the propagation of wave packets in ABC-stacked multilayer graphene: an analytical and computational approach

Author

Lavor, I. R., da Costa, D. R., Chaves, Andrey, Sena, S. H. R., Farias, G. A., Van Duppen, B., and Peeters, F. M.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The time evolution of a low-energy two-dimensional Gaussian wave packet in ABC-stacked $n$-layer graphene (ABC-NLG) is investigated. Expectation values of the position $(x,y)$ of center-of-mass and the total probability densities of the wave packet are calculated analytically using the Green's function method. These results are confirmed using an alternative numerical method based on the split-operator technique within the Dirac approach for ABC-NLG, which additionally allows to include external fields and potentials. The main features of the zitterbewegung (trembling motion) of wave packets in graphene are demonstrated and are found to depend not only on the wave packet width and initial pseudospin polarization, but also on the number of layers. Moreover, the analytical and numerical methods proposed here allow to investigate wave packet dynamics in graphene systems with an arbitrary number of layers and arbitrary potential landscapes., Comment: 14 pages, 8 figures

Published
2020
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35. Electronic properties of bilayer graphene catenoid bridge

Author

Silva, J. E. G., Saraiva, J., Santhiago, T. M., Ramos, Antonio C. A., and da Costa, D. R.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We study the properties of an electron on a catenoid surface. The catenoid is understood as a realization of a bridge connecting two graphene layer by a smooth surface. The curvature induces a symmetrical reflectionless potential well around the bridge with one bound-state for $m=0$. For $m\neq 0$, a centrifugal potential barrier arises controlling the tunnelling between the layers. An external electric field breaks the parity symmetry and provides a barrier that controls the conductance from one layer to another. By applying a constant magnetic field the effective potential exhibits a confining double-well potential nearby the bridge. We obtain the corresponding bound states and study the effects of the curvature on the Landau levels., Comment: 7 figures

Published
2020
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38. Electron collimation at van der Waals domain walls in bilayer graphene

Author

Abdullah, Hasan M., da Costa, D. R., Bahlouli, H., Chaves, A., Peeters, F. M., and Van Duppen, Ben

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We show that a domain wall separating single layer graphene (SLG) and AA-stacked bilayer graphene (AA-BLG) can be used to generate highly collimated electron beams which can be steered by a magnetic field. Such system exists in two distinct configurations, namely, locally delaminated AA-BLG and terminated AA-BLG whose terminal edge-type can be either zigzag or armchair. We investigate the electron scattering using semi-classical dynamics and verify the results independently with wave-packed dynamics simulations. We find that the proposed system supports two distinct types of collimated beams that correspond to the lower and upper cones in AA-BLG. Our computational results also reveal that collimation is robust against the number of layers connected to AA-BLG and terminal edges., Comment: 12 pages, 11 figures

Published
2019
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39. Physics potential of the International Axion Observatory (IAXO)

Author

Armengaud, E., Attie, D., Basso, S., Brun, P., Bykovskiy, N., Carmona, J. M., Castel, J. F., Cebrián, S., Cicoli, M., Civitani, M., Cogollos, C., Conlon, J. P., Costa, D., Dafni, T., Daido, R., Derbin, A. V., Descalle, M. A., Desch, K., Dratchnev, I. S., Döbrich, B., Dudarev, A., Ferrer-Ribas, E., Fleck, I., Galán, J., Galanti, G., Garrido, L., Gascon, D., Gastaldo, L., Germani, C., Ghisellini, G., Giannotti, M., Giomataris, I., Gninenko, S., Golubev, N., Graciani, R., Irastorza, I. G., Jakovcic, K., Kaminski, J., Krcmar, M., Krieger, C., Lakić, B., Lasserre, T., Laurent, P., Limousin, O., Lindner, A., Lomskaya, I., Lubsandorzhiev, B., Luzón, G., Marsh, M. C. D., Mergalejo, C., Mescia, F., Meyer, M., Miralda-Escudé, J., Mirallas, H., Muratova, V. N., Navick, X. F., Nones, C., Notari, A., Nozik, A., de Solórzano, A. Ortiz, Pantuev, V., Papaevangelou, T., Pareschi, G., Perez, K., Picatoste, E., Pivovaroff, M. J., Redondo, J., Ringwald, A., Roncadelli, M., Ruiz-Chóliz, E., Ruz, J., Saikawa, K., Salvadó, J., Samperiz, M. P., Schiffer, T., Schmidt, S., Schneekloth, U., Schott, M., Silva, H., Tagliaferri, G., Takahashi, F., Tavecchio, F., Kate, H. ten, Tkachev, I., Troitsky, S., Unzhakov, E., Vedrine, P., Vogel, J. K., Weinsheimer, C., Weltman, A., and Yin, W.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

We review the physics potential of a next generation search for solar axions: the International Axion Observatory (IAXO). Endowed with a sensitivity to discover axion-like particles (ALPs) with a coupling to photons as small as $g_{a\gamma}\sim 10^{-12}$ GeV$^{-1}$, or to electrons $g_{ae}\sim$10$^{-13}$, IAXO has the potential to find the QCD axion in the 1 meV$\sim$1 eV mass range where it solves the strong CP problem, can account for the cold dark matter of the Universe and be responsible for the anomalous cooling observed in a number of stellar systems. At the same time, IAXO will have enough sensitivity to detect lower mass axions invoked to explain: 1) the origin of the anomalous "transparency" of the Universe to gamma-rays, 2) the observed soft X-ray excess from galaxy clusters or 3) some inflationary models. In addition, we review string theory axions with parameters accessible by IAXO and discuss their potential role in cosmology as Dark Matter and Dark Radiation as well as their connections to the above mentioned conundrums., Comment: Prepared for submission to JCAP; new version with very minor corrections after referee review

Published
2019
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44. Influence of HER2 expression on prognosis in metastatic triple-negative breast cancer—results from an international, multicenter analysis coordinated by the AGMT Study Group

Author

Balic, Marija, Heibl, Sonja, Zabernigg, August Felix, Egle, Daniel, Sandholzer, Margit, Roitner, Florian, Andel, Johannes, Pichler, Petra, Hager, Christopher, Knauer, Michael, Hubalek, Michael, Bighin, Claudia, De Laurentiis, Michelino, De Placido, Sabino, Puglisi, Fabio, Boni, Luca, de Gregorio, Amelie, Degenhardt, Tom, Formisano, Luigi, Beelen, Karin, Robinson, Timothy, Fitzpatrick, Amanda, Dieras, Veronique, Muller, Volkmar, Gennari, Alessandra, Linn, Sabine, Braga, Sofia, Cortes, Javier, Palmieri, Carlo, Gampenrieder, S.P., Dezentjé, V., Lambertini, M., de Nonneville, A., Marhold, M., Le Du, F., Cortés Salgado, A., Alpuim Costa, D., Vaz Batista, M., Chic Ruché, N., Tinchon, C., Petzer, A., Blondeaux, E., Del Mastro, L., Targato, G., Bertucci, F., Gonçalves, A., Viret, F., Bartsch, R., Mannsbart, C., Deleuze, A., Robert, L., Saavedra Serrano, C., Gion Cortés, M., Sampaio-Alves, M., Vitorino, M., Pecen, L., Singer, C., Harbeck, N., Rinnerthaler, G., and Greil, R.

Published
2023
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45. Conditions for the occurrence of Coulomb blockade in phosphorene quantum dots at room temperature

Author

Melo, H. A., Lino, M. A., da Costa, D. R., Chaves, A., Pereira Jr., J. M., Farias, G. A., and de Sousa, J. S.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We study the addition energy spectra of phosphorene quantum dots focusing on the role of dot size, edges passivation, number of layers and dielectric constant of the substrate where the dots are deposited. We show that for sufficiently low dielectric constants ($\varepsilon_{sub} < 4$), Coulomb blockade can be observed in dot sizes larger than 10 nm, for both passivated and unpassivated edges. For higher dielectric constants (up to $\varepsilon_{sub} = 30$), Coulomb blockade demands smaller dot sizes, but this depends whether the edges are passivated or not. This dramatic role played by the substrate is expected to impact on the development of application based on phosphorene quantum dots.

Published
2018
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50. Overview of the EUROfusion Tokamak Exploitation programme in support of ITER and DEMO

Author

Joffrin, E, Wischmeier, M, Baruzzo, M, Hakola, A, Kappatou, A, Keeling, D, Labit, B, Tsitrone, E, Vianello, N, Abate, D, Adamek, J, Agostini, M, Albert, C, Devasagayam, F, Aleiferis, S, Alessi, E, Alhage, J, Allan, S, Allcock, J, Alonzo, M, Anastasiou, G, Sunden, E, Angioni, C, Anquetin, Y, Appel, L, Apruzzese, G, Ariola, M, Arnas, C, Artaud, J, Arter, W, Asztalos, O, Aucone, L, Aumeunier, M, Auriemma, F, Ayllon, J, Aymerich, E, Baciero, A, Bagnato, F, Bahner, L, Bairaktaris, F, Balazs, P, Balbinot, L, Balboa, I, Balden, M, Balestri, A, Ruiz, M, Barberis, T, Barcellona, C, Bardsley, O, Benkadda, S, Bensadon, T, Bernard, E, Bernert, M, Betar, H, Morales, R, Bielecki, J, Bilato, R, Bilkova, P, Bin, W, Birkenmeier, G, Bisson, R, Blanchard, P, Bleasdale, A, Bobkov, V, Boboc, A, Bock, A, Bogar, K, Bohm, P, Bolzonella, T, Bombarda, F, Bonanomi, N, Boncagni, L, Bonfiglio, D, Bonifetto, R, Bonotto, M, Borodin, D, Borodkina, I, Bosman, T, Bourdelle, C, Bowman, C, Brezinsek, S, Brida, D, Brochard, F, Brunet, R, Brunetti, D, Bruno, V, Buchholz, R, Buermans, J, Bufferand, H, Buratti, P, Burckhart, A, Cai, J, Calado, R, Caloud, J, Cancelli, S, Cani, F, Cannas, B, Cappelli, M, Carcangiu, S, Cardinali, A, Carli, S, Carnevale, D, Carole, M, Carpita, M, Carralero, D, Caruggi, F, Carvalho, I, Casiraghi, I, Casolari, A, Casson, F, Castaldo, C, Cathey, A, Causa, F, Cavalier, J, Cavedon, M, Cazabonne, J, Cecconello, M, Ceelen, L, Celora, A, Cerovsky, J, Challis, C, Chandra, R, Chankin, A, Chapman, B, Chen, H, Chernyshova, M, Chiariello, A, Chmielewski, P, Chomiczewska, A, Cianfarani, C, Ciraolo, G, Citrin, J, Clairet, F, Coda, S, Coelho, R, Coenen, J, Coffey, I, Colandrea, C, Colas, L, Conroy, S, Contre, C, Conway, N, Cordaro, L, Corre, Y, Costa, D, Costea, S, Coster, D, Courtois, X, Cowley, C, Craciunescu, T, Croci, G, Croitoru, A, Crombe, K, Cruz Zabala, D, Cseh, G, Czarski, T, Da Ros, A, Dal Molin, A, Dalla Rosa, M, Damizia, Y, D'Arcangelo, O, David, P, De Angeli, M, De la Cal, E, De La Luna, E, De Tommasi, G, Decker, J, Dejarnac, R, Del Sarto, D, Derks, G, Desgranges, C, Devynck, P, Di Genova, S, di Grazia, L, Di Siena, A, Dicorato, M, Diez, M, Dimitrova, M, Dittmar, T, Dittrich, L, Palacios Duran, J, Donnel, P, Douai, D, Dowson, S, Doyle, S, Dreval, M, Drews, P, Dubus, L, Dumont, R, Dunai, D, Dunne, M, Durif, A, Durodie, F, Durr Legoupil Nicoud, G, Duval, B, Dux, R, Eich, T, Ekedahl, A, Elmore, S, Ericsson, G, Eriksson, J, Eriksson, B, Eriksson, F, Ertmer, S, Escarguel, A, Esposito, B, Estrada, T, Fable, E, Faitsch, M, Fakhrayi Mofrad, N, Fanni, A, Farley, T, Farnik, M, Fedorczak, N, Felici, F, Feng, X, Ferreira, J, Ferreira, D, Ferron, N, Fevrier, O, Ficker, O, Field, A, Figueiredo, A, Fil, N, Fiorucci, D, Firdaouss, M, Fischer, R, Fitzgerald, M, Flebbe, M, Fontana, M, Climent, J, Frank, A, Fransson, E, Frassinetti, L, Frigione, D, Futatani, S, Futtersack, R, Gabriellini, S, Gadariya, D, Galassi, D, Galazka, K, Galdon, J, Galeani, S, Gallart, D, Gallo, A, Galperti, C, Gambrioli, M, Garavaglia, S, Garcia, J, Munoz, M, Gardarein, J, Garzotti, L, Gaspar, J, Gatto, R, Gaudio, P, Gelfusa, M, Gerardin, J, Gerasimov, S, Miguelanez, R, Gervasini, G, Ghani, Z, Ghezzi, F, Ghillardi, G, Giannone, L, Gibson, S, Gil, L, Gillgren, A, Giovannozzi, E, Giroud, C, Giruzzi, G, Gleiter, T, Gobbin, M, Goloborodko, V, Ganzabal, A, Goodman, T, Gopakumar, V, Gorini, G, Gorler, T, Gorno, S, Granucci, G, Greenhouse, D, Grenfell, G, Griener, M, Gromelski, W, Groth, M, Grover, O, Gruca, M, Gude, A, Guillemaut, C, Guirlet, R, Gunn, J, Gyergyek, T, Hagg, L, Hall, J, Ham, C, Hamed, M, Happel, T, Harrer, G, Harrison, J, Harting, D, Hawkes, N, Heinrich, P, Henderson, S, Hennequin, P, Henriques, R, Heuraux, S, Salaverri, J, Hillairet, J, Hillesheim, J, Hjalmarsson, A, Ho, A, Hobirk, J, Hodille, E, Holzl, M, Hoppe, M, Horacek, J, Horsten, N, Horvath, L, Houry, M, Hromasova, K, Huang, J, Huang, Z, Huber, A, Huett, E, Huynh, P, Iantchenko, A, Imrisek, M, Innocente, P, Schrittwieser, C, Isliker, H, Ivanova, P, Stanik, I, Jablczynska, M, Jachmich, S, Jacobsen, A, Jacquet, P, van Vuuren, A, Jardin, A, Jarleblad, H, Jarvinen, A, Jaulmes, F, Jensen, T, Jepu, I, Jessica, S, Johnson, T, Juven, A, Kalis, J, Karhunen, J, Karimov, R, Karpushov, A, Kasilov, S, Kazakov, Y, Kazantzidis, P, Kernbichler, W, Kim, H, King, D, Kiptily, V, Kirjasuo, A, Kirov, K, Kirschner, A, Kit, A, Kiviniemi, T, Kjaer, F, Klinkby, E, Knieps, A, Knoche, U, Kochan, M, Kochl, F, Kocsis, G, Koenders, J, Kogan, L, Kolesnichenko, Y, Kominis, Y, Komm, M, Kong, M, Kool, B, Korsholm, S, Kos, D, Koubiti, M, Kovacic, J, Kovtun, Y, Strzeciwilk, E, Koziol, K, Kozulia, M, Flecken, A, Kreter, A, Krieger, K, Kruezi, U, Krutkin, O, Kudlacek, O, Kumar, U, Kumpulainen, H, Kushoro, M, Kwiatkowski, R, La Matina, M, Lacquaniti, M, Laguardia, L, Lainer, P, Lang, P, Larsen, M, Laszynska, E, Lawson, K, Lazaros, A, Lazzaro, E, Lee, M, Leerink, S, Lehnen, M, Lennholm, M, Lerche, E, Liang, Y, 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Montisci, A, Morales, J, Moreau, P, Moret, J, Moro, A, Moulton, D, Mulholland, P, Muraglia, M, Murari, A, Muraro, A, Muscente, P, Mykytchuk, D, Nabais, F, Nakeva, Y, Napoli, F, Nardon, E, Nave, M, Nem, R, Nielsen, A, Nielsen, S, Nocente, M, Nouailletas, R, Nowak, S, Nystrom, H, Ochoukov, R, Offeddu, N, Olasz, S, Olde, C, Oliva, F, Oliveira, D, Oliver, H, Ollus, P, Ongena, J, Orsitto, F, Osborne, N, Otin, R, Dominguez, P, Palade, D, Palomba, S, Pan, O, Panadero, N, Panontin, E, Papadopoulos, A, Papagiannis, P, Papp, G, Parail, V, Pardanaud, C, Parisi, J, Parrott, A, Paschalidis, K, Passoni, M, Pastore, F, Patel, A, Patel, B, Pau, A, Pautasso, G, Pavlichenko, R, Pawelec, E, Pegourie, B, Pelka, G, Peluso, E, Perek, A, Cippo, E, Von Thun, C, Petersson, P, Petravich, G, Peysson, Y, Piergotti, V, Pigatto, L, Piron, C, Piron, L, Pironti, A, Pisano, F, Plank, U, Ploeckl, B, Plyusnin, V, Podolnik, A, Poels, Y, Pokol, G, Poley, J, Por, G, Poradzinski, M, Porcelli, F, Porte, L, Possieri, C, 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C. P. A., Aleiferis S., Alessi E., Alhage J., Allan S., Allcock J., Alonzo M., Anastasiou G., Sunden E. A., Angioni C., Anquetin Y., Appel L., Apruzzese G. M., Ariola M., Arnas C., Artaud J. F., Arter W., Asztalos O., Aucone L., Aumeunier M. H., Auriemma F., Ayllon J., Aymerich E., Baciero A., Bagnato F., Bahner L., Bairaktaris F., Balazs P., Balbinot L., Balboa I., Balden M., Balestri A., Ruiz M. B., Barberis T., Barcellona C., Bardsley O., Benkadda S., Bensadon T., Bernard E., Bernert M., Betar H., Morales R. B., Bielecki J., Bilato R., Bilkova P., Bin W., Birkenmeier G., Bisson R., Blanchard P., Bleasdale A., Bobkov V., Boboc A., Bock A., Bogar K., Bohm P., Bolzonella T., Bombarda F., Bonanomi N., Boncagni L., Bonfiglio D., Bonifetto R., Bonotto M., Borodin D., Borodkina I., Bosman T. O. S. J., Bourdelle C., Bowman C., Brezinsek S., Brida D., Brochard F., Brunet R., Brunetti D., Bruno V., Buchholz R., Buermans J., Bufferand H., Buratti P., Burckhart A., Cai J., Calado R., Caloud J., Cancelli S., Cani F., Cannas B., Cappelli M., Carcangiu S., Cardinali A., Carli S., Carnevale D., Carole M., Carpita M., Carralero D., Caruggi F., Carvalho I. S., Casiraghi I., Casolari A., Casson F. J., Castaldo C., Cathey A., Causa F., Cavalier J., Cavedon M., Cazabonne J., Cecconello M., Ceelen L., Celora A., Cerovsky J., Challis C. D., Chandra R., Chankin A., Chapman B., Chen H., Chernyshova M., Chiariello A. G., Chmielewski P., Chomiczewska A., Cianfarani C., Ciraolo G., Citrin J., Clairet F., Coda S., Coelho R., Coenen J. W., Coffey I. H., Colandrea C., Colas L., Conroy S., Contre C., Conway N. J., Cordaro L., Corre Y., Costa D., Costea S., Coster D., Courtois X., Cowley C., Craciunescu T., Croci G., Croitoru A. M., Crombe K., Cruz Zabala D. J., Cseh G., Czarski T., Da Ros A., Dal Molin A., Dalla Rosa M., Damizia Y., D'Arcangelo O., David P., De Angeli M., De la Cal E., De La Luna E., De Tommasi G., Decker J., Dejarnac R., Del Sarto D., Derks G., Desgranges C., Devynck P., Di Genova S., di Grazia L. E., Di Siena A., Dicorato M., Diez M., Dimitrova M., Dittmar T., Dittrich L., Palacios Duran J. J. D., Donnel P., Douai D., Dowson S., Doyle S., Dreval M., Drews P., Dubus L., Dumont R., Dunai D., Dunne M., Durif A., Durodie F., Durr Legoupil Nicoud G., Duval B., Dux R., Eich T., Ekedahl A., Elmore S., Ericsson G., Eriksson J., Eriksson B., Eriksson F., Ertmer S., Escarguel A., Esposito B., Estrada T., Fable E., Faitsch M., Fakhrayi Mofrad N., Fanni A., Farley T., Farnik M., Fedorczak N., Felici F., Feng X., Ferreira J., Ferreira D., Ferron N., Fevrier O., Ficker O., Field A. R., Figueiredo A., Fil N., Fiorucci D., Firdaouss M., Fischer R., Fitzgerald M., Flebbe M., Fontana M., Climent J. F., Frank A., Fransson E., Frassinetti L., Frigione D., Futatani S., Futtersack R., Gabriellini S., Gadariya D., Galassi D., Galazka K., Galdon J., Galeani S., Gallart D., Gallo A., Galperti C., Gambrioli M., Garavaglia S., Garcia J., Munoz M. G., Gardarein J., Garzotti L., Gaspar J., Gatto R., Gaudio P., Gelfusa M., Gerardin J., Gerasimov S. N., Miguelanez R. G., Gervasini G., Ghani Z., Ghezzi F. M., Ghillardi G., Giannone L., Gibson S., Gil L., Gillgren A., Giovannozzi E., Giroud C., Giruzzi G., Gleiter T., Gobbin M., Goloborodko V., Ganzabal A. G., Goodman T., Gopakumar V., Gorini G., Gorler T., Gorno S., Granucci G., Greenhouse D., Grenfell G., Griener M., Gromelski W., Groth M., Grover O., Gruca M., Gude A., Guillemaut C., Guirlet R., Gunn J., Gyergyek T., Hagg L., Hall J., Ham C. J., Hamed M., Happel T., Harrer G., Harrison J., Harting D., Hawkes N. C., Heinrich P., Henderson S., Hennequin P., Henriques R., Heuraux S., Salaverri J. H., Hillairet J., Hillesheim J. C., Hjalmarsson A., Ho A., Hobirk J., Hodille E., Holzl M., Hoppe M., Horacek J., Horsten N., Horvath L., Houry M., Hromasova K., Huang J., Huang Z., Huber A., Huett E., Huynh P., Iantchenko A., Imrisek M., Innocente P., Schrittwieser C. I., Isliker H., Ivanova P., Stanik I. I., Jablczynska M., Jachmich S., Jacobsen A. S., Jacquet P., van Vuuren A. J., Jardin A., Jarleblad H., Jarvinen A., Jaulmes F., Jensen T., Jepu I., Jessica S., Johnson T., Juven A., Kalis J., Karhunen J., Karimov R., Karpushov A. N., Kasilov S., Kazakov Y., Kazantzidis P. V., Kernbichler W., Kim H. T., King D. B., Kiptily V. G., Kirjasuo A., Kirov K. K., Kirschner A., Kit A., Kiviniemi T., Kjaer F., Klinkby E., Knieps A., Knoche U., Kochan M., Kochl F., Kocsis G., Koenders J. T. W., Kogan L., Kolesnichenko Y., Kominis Y., Komm M., Kong M., Kool B., Korsholm S. B., Kos D., Koubiti M., Kovacic J., Kovtun Y., Strzeciwilk E. K., Koziol K., Kozulia M., Flecken A. 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Abstract

Within the 9th European Framework programme, since 2021 EUROfusion is operating five tokamaks under the auspices of a single Task Force called ‘Tokamak Exploitation’. The goal is to benefit from the complementary capabilities of each machine in a coordinated way and help in developing a scientific output scalable to future largre machines. The programme of this Task Force ensures that ASDEX Upgrade, MAST-U, TCV, WEST and JET (since 2022) work together to achieve the objectives of Missions 1 and 2 of the EUROfusion Roadmap: i) demonstrate plasma scenarios that increase the success margin of ITER and satisfy the requirements of DEMO and, ii) demonstrate an integrated approach that can handle the large power leaving ITER and DEMO plasmas. The Tokamak Exploitation task force has therefore organized experiments on these two missions with the goal to strengthen the physics and operational basis for the ITER baseline scenario and for exploiting the recent plasma exhaust enhancements in all four devices (PEX: Plasma EXhaust) for exploring the solution for handling heat and particle exhaust in ITER and develop the conceptual solutions for DEMO. The ITER Baseline scenario has been developed in a similar way in ASDEX Upgrade, TCV and JET. Key risks for ITER such as disruptions and run-aways have been also investigated in TCV, ASDEX Upgrade and JET. Experiments have explored successfully different divertor configurations (standard, super-X, snowflakes) in MAST-U and TCV and studied tungsten melting in WEST and ASDEX Upgrade. The input from the smaller devices to JET has also been proven successful to set-up novel control schemes on disruption avoidance and detachment.

Published
2024

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