23 results on '"Wurdack, Matthias"'
Search Results
2. Interactions between Fermi polarons in monolayer WS2
- Author
-
Muir, Jack B., Levinsen, Jesper, Earl, Stuart K., Conway, Mitchell A., Cole, Jared H., Wurdack, Matthias, Mishra, Rishabh, Ing, David J., Estrecho, Eliezer, Lu, Yuerui, Efimkin, Dmitry K., Tollerud, Jonathan O., Ostrovskaya, Elena A., Parish, Meera M., and Davis, Jeffrey A.
- Published
- 2022
- Full Text
- View/download PDF
3. Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity.
- Author
-
Waldherr, Max, Lundt, Nils, Klaas, Martin, Betzold, Simon, Wurdack, Matthias, Baumann, Vasilij, Estrecho, Eliezer, Nalitov, Anton, Cherotchenko, Evgenia, Cai, Hui, Ostrovskaya, Elena A, Kavokin, Alexey V, Tongay, Sefaattin, Klembt, Sebastian, Höfling, Sven, and Schneider, Christian
- Subjects
cond-mat.quant-gas - Abstract
Bosonic condensation belongs to the most intriguing phenomena in physics, and was mostly reserved for experiments with ultra-cold quantum gases. More recently, it became accessible in exciton-based solid-state systems at elevated temperatures. Here, we demonstrate bosonic condensation driven by excitons hosted in an atomically thin layer of MoSe2, strongly coupled to light in a solid-state resonator. The structure is operated in the regime of collective strong coupling between a Tamm-plasmon resonance, GaAs quantum well excitons, and two-dimensional excitons confined in the monolayer crystal. Polariton condensation in a monolayer crystal manifests by a superlinear increase of emission intensity from the hybrid polariton mode, its density-dependent blueshift, and a dramatic collapse of the emission linewidth, a hallmark of temporal coherence. Importantly, we observe a significant spin-polarization in the injected polariton condensate, a fingerprint for spin-valley locking in monolayer excitons. Our results pave the way towards highly nonlinear, coherent valleytronic devices and light sources.
- Published
- 2018
4. High-mobility p-type semiconducting two-dimensional β-TeO2
- Author
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Zavabeti, Ali, Aukarasereenont, Patjaree, Tuohey, Hayden, Syed, Nitu, Jannat, Azmira, Elbourne, Aaron, Messalea, Kibret A., Zhang, Bao Yue, Murdoch, Billy J., Partridge, James G., Wurdack, Matthias, Creedon, Daniel L., van Embden, Joel, Kalantar-Zadeh, Kourosh, Russo, Salvy P., McConville, Chris F., and Daeneke, Torben
- Published
- 2021
- Full Text
- View/download PDF
5. Author Correction: High-mobility p-type semiconducting two-dimensional β-TeO2
- Author
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Zavabeti, Ali, Aukarasereenont, Patjaree, Tuohey, Hayden, Syed, Nitu, Jannat, Azmira, Elbourne, Aaron, Messalea, Kibret A., Zhang, Bao Yue, Murdoch, Billy J., Partridge, James G., Wurdack, Matthias, Creedon, Daniel L., van Embden, Joel, Kalantar-Zadeh, Kourosh, Russo, Salvy P., McConville, Chris F., and Daeneke, Torben
- Published
- 2021
- Full Text
- View/download PDF
6. Investigation of the nonlinear refractive index of single-crystalline thin gold films and plasmonic nanostructures
- Author
-
Goetz, Sebastian, Razinskas, Gary, Krauss, Enno, Dreher, Christian, Wurdack, Matthias, Geisler, Peter, Pawłowska, Monika, Hecht, Bert, and Brixner, Tobias
- Published
- 2016
- Full Text
- View/download PDF
7. Interactions between Fermi polarons in monolayer WS2.
- Author
-
Muir, Jack B., Levinsen, Jesper, Earl, Stuart K., Conway, Mitchell A., Cole, Jared H., Wurdack, Matthias, Mishra, Rishabh, Ing, David J., Estrecho, Eliezer, Lu, Yuerui, Efimkin, Dmitry K., Tollerud, Jonathan O., Ostrovskaya, Elena A., Parish, Meera M., and Davis, Jeffrey A.
- Subjects
POLARONS ,BINDING energy ,BOUND states ,ELECTRON-electron interactions ,PROPERTIES of matter ,TWO-dimensional electron gas - Abstract
Interactions between quasiparticles are of fundamental importance and ultimately determine the macroscopic properties of quantum matter. A famous example is the phenomenon of superconductivity, which arises from attractive electron-electron interactions that are mediated by phonons or even other more exotic fluctuations in the material. Here we introduce mobile exciton impurities into a two-dimensional electron gas and investigate the interactions between the resulting Fermi polaron quasiparticles. We employ multi-dimensional coherent spectroscopy on monolayer WS
2 , which provides an ideal platform for determining the nature of polaron-polaron interactions due to the underlying trion fine structure and the valley specific optical selection rules. At low electron doping densities, we find that the dominant interactions are between polaron states that are dressed by the same Fermi sea. In the absence of bound polaron pairs (bipolarons), we show using a minimal microscopic model that these interactions originate from a phase-space filling effect, where excitons compete for the same electrons. We furthermore reveal the existence of a bipolaron bound state with remarkably large binding energy, involving excitons in different valleys cooperatively bound to the same electron. Our work lays the foundation for probing and understanding strong electron correlation effects in two-dimensional layered structures such as moiré superlattices. Here, the authors investigate the interactions between Fermi polarons in monolayer WS2 by multi-dimensional coherent spectroscopy, and find that, at low electron doping densities, the dominant interactions are between polaron states that are dressed by the same Fermi sea. They also observe a bipolaron bound state with large binding energy, involving excitons in different valleys cooperatively bound to the same electron. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
8. Fabrication of high-quality PMMA/SiOx spaced planar microcavities for strong coupling of light with monolayer WS2 excitons.
- Author
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Yun, Tinghe, Estrecho, Eliezer, Truscott, Andrew G., Ostrovskaya, Elena A., and Wurdack, Matthias J.
- Subjects
MONOMOLECULAR films ,METAL crystals ,OSCILLATOR strengths ,QUALITY factor ,TRANSITION metals ,EXCITON theory ,COLLOIDAL crystals - Abstract
Exciton polaritons in atomically thin transition metal dichalcogenide crystals (monolayer TMDCs) have emerged as a promising candidate to enable topological transport, ultra-efficient laser technologies, and collective quantum phenomena such as polariton condensation and superfluidity at room temperature. However, integrating monolayer TMDCs into high-quality planar microcavities to achieve the required strong coupling between the cavity photons and the TMDC excitons (bound electron–hole pairs) has proven challenging. Previous approaches to integration had to compromise between various adverse effects on the strength of light–matter interactions in the monolayer, the cavity photon lifetime, and the lateral size of the microcavity. Here, we demonstrate a scalable approach to fabricate high-quality planar microcavities with an integrated monolayer WS
2 layer-by-layer by using polymethyl methacrylate/silicon oxide (PMMA/SiOx ) as a cavity spacer. Because the exciton oscillator strength is well protected against the required processing steps by the PMMA layer, the microcavities investigated in this work, which have quality factors of above 103 , can operate in the strong light–matter coupling regime at room temperature. This is an important step toward fabricating wafer-scale and patterned microcavities for engineering the exciton-polariton potential landscape, which is essential for enabling many proposed technologies. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
9. Large Area Ultrathin InN and Tin Doped InN Nanosheets Featuring 2D Electron Gases.
- Author
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Syed, Nitu, Stacey, Alastair, Zavabeti, Ali, Nguyen, Chung Kim, Haas, Benedikt, Koch, Christoph T., Creedon, Daniel L., Della Gaspera, Enrico, Reineck, Philipp, Jannat, Azmira, Wurdack, Matthias, Bamford, Sarah E., Pigram, Paul J., Tawfik, Sherif Abdulkader, Russo, Salvy P., Murdoch, Billy J., Kalantar-Zadeh, Kourosh, McConville, Chris F., and Daeneke, Torben
- Published
- 2022
- Full Text
- View/download PDF
10. Influence of direct deposition of dielectric materials on the optical response of monolayer WS2.
- Author
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Yun, Tinghe, Wurdack, Matthias, Pieczarka, Maciej, Bhattacharyya, Semonti, Ou, Qingdong, Notthoff, Christian, Nguyen, Chung Kim, Daeneke, Torben, Kluth, Patrick, Fuhrer, Michael S., Truscott, Andrew G., Estrecho, Eliezer, and Ostrovskaya, Elena A.
- Subjects
- *
DIELECTRIC materials , *OPTICAL materials , *PLASMA-enhanced chemical vapor deposition , *ATOMIC layer deposition , *CRYSTAL defects , *MONOMOLECULAR films - Abstract
We investigate the effects of direct deposition of different dielectric materials (AlOx, SiOx, SiNx) onto atomically thin TMDC WS2 on its optical response using atomic layer deposition (ALD), electron beam evaporation (EBE), plasma-enhanced chemical vapor deposition (PECVD), and magnetron sputtering. The photoluminescence measurements reveal quenching of the excitonic emission after all deposition processes, which is linked to the increased level of charge doping and associated rise of the trion emission and/or the localized (bound) exciton emission. Furthermore, Raman spectroscopy allows us to clearly correlate the observed changes in excitonic emission with the increased levels of lattice disorder and defects. In particular, we show that the different doping levels in a monolayer WS2 capped by a dielectric material are strongly related to the defects in the WS2 crystal introduced by all capping methods, except for ALD. The strong charge doping in the ALD-capped sample seems to be caused by other factors, such as deviations in the dielectric layer stoichiometry or chemical reactions on the monolayer surface, which makes ALD distinct from all other techniques. Overall, the EBE process results in the lowest level of doping and defect densities and in the largest spectral weight of the exciton emission in the PL. Sputtering is revealed as the most aggressive dielectric capping method for WS2, fully quenching its optical response. Our results demonstrate and quantify the effects of direct deposition of dielectric materials onto monolayer WS2, which can provide valuable guidance for the efforts to integrate monolayer TMDCs into functional optoelectronic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
11. Influence of direct deposition of dielectric materials on the optical response of monolayer WS2.
- Author
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Yun, Tinghe, Wurdack, Matthias, Pieczarka, Maciej, Bhattacharyya, Semonti, Ou, Qingdong, Notthoff, Christian, Nguyen, Chung Kim, Daeneke, Torben, Kluth, Patrick, Fuhrer, Michael S., Truscott, Andrew G., Estrecho, Eliezer, and Ostrovskaya, Elena A.
- Subjects
DIELECTRIC materials ,OPTICAL materials ,PLASMA-enhanced chemical vapor deposition ,ATOMIC layer deposition ,CRYSTAL defects ,MONOMOLECULAR films - Abstract
We investigate the effects of direct deposition of different dielectric materials (AlO
x , SiOx , SiNx ) onto atomically thin TMDC WS2 on its optical response using atomic layer deposition (ALD), electron beam evaporation (EBE), plasma-enhanced chemical vapor deposition (PECVD), and magnetron sputtering. The photoluminescence measurements reveal quenching of the excitonic emission after all deposition processes, which is linked to the increased level of charge doping and associated rise of the trion emission and/or the localized (bound) exciton emission. Furthermore, Raman spectroscopy allows us to clearly correlate the observed changes in excitonic emission with the increased levels of lattice disorder and defects. In particular, we show that the different doping levels in a monolayer WS2 capped by a dielectric material are strongly related to the defects in the WS2 crystal introduced by all capping methods, except for ALD. The strong charge doping in the ALD-capped sample seems to be caused by other factors, such as deviations in the dielectric layer stoichiometry or chemical reactions on the monolayer surface, which makes ALD distinct from all other techniques. Overall, the EBE process results in the lowest level of doping and defect densities and in the largest spectral weight of the exciton emission in the PL. Sputtering is revealed as the most aggressive dielectric capping method for WS2 , fully quenching its optical response. Our results demonstrate and quantify the effects of direct deposition of dielectric materials onto monolayer WS2 , which can provide valuable guidance for the efforts to integrate monolayer TMDCs into functional optoelectronic devices. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
12. Micro-mechanical assembly and characterization of high-quality Fabry–Pérot microcavities for the integration of two-dimensional materials.
- Author
-
Rupprecht, Christoph, Lundt, Nils, Wurdack, Matthias, Stepanov, Petr, Estrecho, Eliezer, Richard, Maxime, Ostrovskaya, Elena A., Höfling, Sven, and Schneider, Christian
- Subjects
QUALITY factor ,DIELECTRIC materials ,MONOMOLECULAR films ,EXCITON theory ,SEMICONDUCTORS - Abstract
Integrating monolayers of two-dimensional semiconductors into optical microcavities is challenging because of the very few available approaches to coat the monolayers with dielectric materials without damaging them. Some strategies have been developed, but they either rely on complicated experimental settings and expensive technologies or limit the achievable cavity quality factors. Thus, high quality Fabry–Pérot microcavities are not widely available to the community focusing on light-matter coupling in atomically thin materials. Here, we detail a recently developed technique to micro-mechanically assemble Fabry–Pérot microcavities. Our approach promotes strong coupling conditions with excitons in atomically thin materials, it does not rely on difficult or expensive technologies, it is reproducible, and it yields microcavities with quality factors approaching 4000. It is ideally suitable for engineering coupled monolayer-cavity systems of advanced complexity in small-scale laboratories. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
13. Ultrathin Ga2O3 Glass: A Large‐Scale Passivation and Protection Material for Monolayer WS2.
- Author
-
Wurdack, Matthias, Yun, Tinghe, Estrecho, Eliezer, Syed, Nitu, Bhattacharyya, Semonti, Pieczarka, Maciej, Zavabeti, Ali, Chen, Shao‐Yu, Haas, Benedikt, Müller, Johannes, Lockrey, Mark N., Bao, Qiaoliang, Schneider, Christian, Lu, Yuerui, Fuhrer, Michael S., Truscott, Andrew G., Daeneke, Torben, and Ostrovskaya, Elena A.
- Published
- 2021
- Full Text
- View/download PDF
14. Observation of hybrid Tamm-plasmon excitonpolaritons with GaAs quantum wells and a MoSe2 monolayerObservation of hybrid Tamm-plasmon excitonpolaritons with GaAs quantum wells and a MoSe2 monolayer.
- Author
-
Wurdack, Matthias, Lundt, Nils, Klaas, Martin, Baumann, Vasilij, Kavokin, Alexey V., Höfling, Sven, and Schneider, Christian
- Subjects
QUANTUM wells ,AUDITING standards ,OPTICAL resonance ,QUANTUM electrodynamics ,MONOMOLECULAR films ,PHOTONS ,EXCITON theory - Abstract
Strong light matter coupling between excitons and microcavity photons, as described in the framework of cavity quantum electrodynamics, leads to the hybridization of light and matter excitations. The regime of collective strong coupling arises, when various excitations from different host media are strongly coupled to the same optical resonance. This leads to a well-controllable admixture of various matter components in three hybrid polariton modes. Here, we study a cavity device with four embedded GaAs quantum wells hosting excitons that are spectrally matched to the A-valley exciton resonance of a MoSe
2 monolayer. The formation of hybrid polariton modes is evidenced in momentum resolved photoluminescence and reflectivity studies. We describe the energy and k-vector distribution of excitonpolaritons along the hybrid modes by a thermodynamic model, which yields a very good agreement with the experiment. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
15. Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity.
- Author
-
Waldherr, Max, Lundt, Nils, Klaas, Martin, Betzold, Simon, Wurdack, Matthias, Baumann, Vasilij, Estrecho, Eliezer, Nalitov, Anton, Cherotchenko, Evgenia, Cai, Hui, Ostrovskaya, Elena A., Kavokin, Alexey V., Tongay, Sefaattin, Klembt, Sebastian, Höfling, Sven, and Schneider, Christian
- Abstract
Bosonic condensation belongs to the most intriguing phenomena in physics, and was mostly reserved for experiments with ultra-cold quantum gases. More recently, it became accessible in exciton-based solid-state systems at elevated temperatures. Here, we demonstrate bosonic condensation driven by excitons hosted in an atomically thin layer of MoSe
2 , strongly coupled to light in a solid-state resonator. The structure is operated in the regime of collective strong coupling between a Tamm-plasmon resonance, GaAs quantum well excitons, and two-dimensional excitons confined in the monolayer crystal. Polariton condensation in a monolayer crystal manifests by a superlinear increase of emission intensity from the hybrid polariton mode, its density-dependent blueshift, and a dramatic collapse of the emission linewidth, a hallmark of temporal coherence. Importantly, we observe a significant spin-polarization in the injected polariton condensate, a fingerprint for spin-valley locking in monolayer excitons. Our results pave the way towards highly nonlinear, coherent valleytronic devices and light sources. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
16. Direct measurement of a non-Hermitian topological invariant in a hybrid light-matter system.
- Author
-
Rui Su, Estrecho, Eliezer, Biegańska, Dąbrówka, Yuqing Huang, Wurdack, Matthias, Pieczarka, Maciej, Truscott, Andrew G., Liew, Timothy C. H., Ostrovskaya, Elena A., and Qihua Xiong
- Subjects
- *
TOPOLOGICAL property , *EXCITON theory , *HYBRID systems , *CONDENSED matter physics , *DISTRIBUTED Bragg reflectors , *SYMMETRY (Physics) , *POLARITONS - Abstract
The article focuses on direct measurement of a non-Hermitian topological invariant in a hybrid light-matter system. Topics include the topology is central to understanding and engineering materials that display robust physical phenomena immune to imperfections, the different topological phases of matter are characterized by topological invariants, and the topological invariant is predicted to emerge from the winding of the complex eigenenergies.
- Published
- 2021
- Full Text
- View/download PDF
17. Hyperspectral study of the coupling between trions in WSe2 monolayers to a circular Bragg grating cavity.
- Author
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Iff, Oliver, Davanco, Marcelo, Betzold, Simon, Moczała-Dusanowska, Magdalena, Wurdack, Matthias, Emmerling, Monika, Höfling, Sven, and Schneider, Christian
- Subjects
- *
BRAGG gratings , *QUANTUM electrodynamics - Abstract
Circular Bragg gratings compose a very appealing photonic platform and nanophotonic interface for the controlled light-matter coupling of emitters in nanomaterials. Here, we discuss the integration of exfoliated monolayers of WSe2 with GaInP Bragg gratings. We apply hyperspectral imaging to our coupled system, and explore the spatio-spectral characteristics of our coupled monolayer-cavity system. Our work represents a valuable step towards the integration of atomically thin quantum emitters in semiconductor nanophotonic cavities. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
18. Metasurface-Controlled Photonic Rashba Effect for Upconversion Photoluminescence.
- Author
-
Tripathi A, Zalogina A, Liao J, Wurdack M, Estrecho E, Zhou J, Jin D, Kruk SS, and Kivshar Y
- Abstract
We demonstrate the effect of spin-momentum locking of upconversion photoluminescence emitted from rare-earth doped nanocrystals coupled to a phase-gradient dielectric metasurface. We observe different directionalities for left and right circular polarized light and associate this experimental observation with the photonic Rashba effect realized for upconverted photoluminescence that is manifested in the spin-dependent splitting of emitted light in the momentum space.
- Published
- 2023
- Full Text
- View/download PDF
19. Direct measurement of a non-Hermitian topological invariant in a hybrid light-matter system.
- Author
-
Su R, Estrecho E, Biegańska D, Huang Y, Wurdack M, Pieczarka M, Truscott AG, Liew TCH, Ostrovskaya EA, and Xiong Q
- Abstract
Topology is central to understanding and engineering materials that display robust physical phenomena immune to imperfections. Different topological phases of matter are characterized by topological invariants. In energy-conserving (Hermitian) systems, these invariants are determined by the winding of eigenstates in momentum space. In non-Hermitian systems, a topological invariant is predicted to emerge from the winding of the complex eigenenergies. Here, we directly measure the non-Hermitian topological invariant arising from exceptional points in the momentum-resolved spectrum of exciton polaritons. These are hybrid light-matter quasiparticles formed by photons strongly coupled to electron-hole pairs (excitons) in a halide perovskite semiconductor at room temperature. We experimentally map out both the real (energy) and imaginary (linewidth) parts of the spectrum near the exceptional points and extract the novel topological invariant—fractional spectral winding. Our work represents an essential step toward realization of non-Hermitian topological phases in a condensed matter system.
- Published
- 2021
- Full Text
- View/download PDF
20. Ultrathin Ga 2 O 3 Glass: A Large-Scale Passivation and Protection Material for Monolayer WS 2 .
- Author
-
Wurdack M, Yun T, Estrecho E, Syed N, Bhattacharyya S, Pieczarka M, Zavabeti A, Chen SY, Haas B, Müller J, Lockrey MN, Bao Q, Schneider C, Lu Y, Fuhrer MS, Truscott AG, Daeneke T, and Ostrovskaya EA
- Abstract
Atomically thin transition metal dichalcogenide crystals (TMDCs) have extraordinary optical properties that make them attractive for future optoelectronic applications. Integration of TMDCs into practical all-dielectric heterostructures hinges on the ability to passivate and protect them against necessary fabrication steps on large scales. Despite its limited scalability, encapsulation of TMDCs in hexagonal boron nitride (hBN) currently has no viable alternative for achieving high performance of the final device. Here, it is shown that the novel, ultrathin Ga
2 O3 glass is an ideal centimeter-scale coating material that enhances optical performance of the monolayers and protects them against further material deposition. In particular, Ga2 O3 capping of monolayer WS2 outperforms commercial-grade hBN in both scalability and optical performance at room temperature. These properties make Ga2 O3 highly suitable for large-scale passivation and protection of monolayer TMDCs in functional heterostructures., (© 2020 Wiley-VCH GmbH.)- Published
- 2021
- Full Text
- View/download PDF
21. Observation of bosonic condensation in a hybrid monolayer MoSe 2 -GaAs microcavity.
- Author
-
Waldherr M, Lundt N, Klaas M, Betzold S, Wurdack M, Baumann V, Estrecho E, Nalitov A, Cherotchenko E, Cai H, Ostrovskaya EA, Kavokin AV, Tongay S, Klembt S, Höfling S, and Schneider C
- Abstract
Bosonic condensation belongs to the most intriguing phenomena in physics, and was mostly reserved for experiments with ultra-cold quantum gases. More recently, it became accessible in exciton-based solid-state systems at elevated temperatures. Here, we demonstrate bosonic condensation driven by excitons hosted in an atomically thin layer of MoSe
2 , strongly coupled to light in a solid-state resonator. The structure is operated in the regime of collective strong coupling between a Tamm-plasmon resonance, GaAs quantum well excitons, and two-dimensional excitons confined in the monolayer crystal. Polariton condensation in a monolayer crystal manifests by a superlinear increase of emission intensity from the hybrid polariton mode, its density-dependent blueshift, and a dramatic collapse of the emission linewidth, a hallmark of temporal coherence. Importantly, we observe a significant spin-polarization in the injected polariton condensate, a fingerprint for spin-valley locking in monolayer excitons. Our results pave the way towards highly nonlinear, coherent valleytronic devices and light sources.- Published
- 2018
- Full Text
- View/download PDF
22. Observation of hybrid Tamm-plasmon exciton- polaritons with GaAs quantum wells and a MoSe 2 monolayer.
- Author
-
Wurdack M, Lundt N, Klaas M, Baumann V, Kavokin AV, Höfling S, and Schneider C
- Abstract
Strong light matter coupling between excitons and microcavity photons, as described in the framework of cavity quantum electrodynamics, leads to the hybridization of light and matter excitations. The regime of collective strong coupling arises, when various excitations from different host media are strongly coupled to the same optical resonance. This leads to a well-controllable admixture of various matter components in three hybrid polariton modes. Here, we study a cavity device with four embedded GaAs quantum wells hosting excitons that are spectrally matched to the A-valley exciton resonance of a MoSe
2 monolayer. The formation of hybrid polariton modes is evidenced in momentum resolved photoluminescence and reflectivity studies. We describe the energy and k-vector distribution of exciton-polaritons along the hybrid modes by a thermodynamic model, which yields a very good agreement with the experiment.Light and matter excitations from host media can hybridize in the strong coupling regime, resulting in the formation of hybrid polariton modes. Here, the authors demonstrate hybridization between tightly bound excitons in a MoSe2 monolayer and excitons in GaAs quantum wells via coupling to a cavity resonance.- Published
- 2017
- Full Text
- View/download PDF
23. Shaping and spatiotemporal characterization of sub-10-fs pulses focused by a high-NA objective.
- Author
-
Pawłowska M, Goetz S, Dreher C, Wurdack M, Krauss E, Razinskas G, Geisler P, Hecht B, and Brixner T
- Abstract
We describe a setup consisting of a 4f pulse shaper and a microscope with a high-NA objective lens and discuss the aspects most relevant for an undistorted spatiotemporal profile of the focused beam. We demonstrate shaper-assisted pulse compression in focus to a sub-10-fs duration using phase-resolved interferometric spectral modulation (PRISM). We introduce a nanostructure-based method for sub-diffraction spatiotemporal characterization of strongly focused pulses. The distortions caused by optical aberrations and space-time coupling from the shaper can be reduced by careful setup design and alignment to about 10 nm in space and 1 fs in time.
- Published
- 2014
- Full Text
- View/download PDF
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