Search

Your search keyword '"Bois, V."' showing total 11 results
Start Over Author "Bois, V." Publication Year Range Last 50 years
11 results on '"Bois, V."'

1. One-dimensional two-orbital SU(N) ultracold fermionic quantum gases at incommensurate filling: a low-energy approach

Author

Bois, V., Fromholz, P., and Lecheminant, P.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

We investigate the zero-temperature phase diagram of two-orbital SU(N) fermionic models at incommensurate filling which are directly relevant to strontium and ytterbium ultracold atoms loading into a one-dimensional optical lattice. Using a low-energy approach that takes into account explicitly the SU(N) symmetry, we find that a spectral gap for the nuclear-spin degrees of freedom is formed for generic interactions. Several phases with one or two gapless modes are then stabilized which describe the competition between different density instabilities. In stark contrast to the N=2 case, no dominant pairing instabilities emerge and the leading superfluid one is rather formed from bound states of 2N fermions., Comment: 11 pages, 4 figures

Published
2016
Full Text
View/download PDF

2. Competing superconducting instabilities in the one-dimensional p-band degenerate cold fermionic system

Author

Bois, V., Capponi, S., Lecheminant, P., and Moliner, M.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Quantum Gases
Abstract

The zero-temperature phase diagram of $p$-orbital two-component fermionic system loaded into a one-dimensional optical lattice is mapped out by means of analytical and numerical techniques. It is shown that the $p$-band model away from half-filling hosts various competing superconducting phases for attractive and repulsive interactions. At quarter filling, we analyze the possible formation of incompressible Mott phases and in particular for repulsive interactions, we find the occurrence of a Mott transition with the formation of fully gapped bond-ordering waves., Comment: published version

Published
2015
Full Text
View/download PDF

3. Phase diagrams of one-dimensional half-filled two-orbital SU(N) cold fermions systems

Author

Bois, V., Capponi, S., Lecheminant, P., Moliner, M., and Totsuka, K.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Quantum Gases
Abstract

We investigate possible realizations of exotic SU(N) symmetry-protected topological (SPT) phases with alkaline-earth cold fermionic atoms loaded into one-dimensional optical lattices. A thorough study of two-orbital generalizations of the standard SU(N) Fermi-Hubbard model, directly relevant to recent experiments, is performed. Using state-of-the-art analytical and numerical techniques, we map out the zero-temperature phase diagrams at half-filling and identify several Mott-insulating phases. While some of them are rather conventional (non-degenerate, charge-density-wave or spin-Peierls like), we also identify, for even-N, two distinct types of SPT phases: an orbital-Haldane phase, analogous to a spin-N/2 Haldane phase, and a topological SU(N) phase, which we fully characterize by its entanglement properties. We also propose sets of non-local order parameters that characterize the SU(N) topological phases found here., Comment: 38 pages, published version

Published
2014
Full Text
View/download PDF

5. Contact line stick-slip motion and meniscus evolution on micrometer-size wavy fibres

Author

Fuentes, C.A., Hatipogullari, Metin, Van Hoof, Sarah, Vitry, Youen, Dehaeck, Sam, Du Bois, V., Lambert, Pierre, Colinet, Pierre, Seveno, David, Van Vuure, A.W., Fuentes, C.A., Hatipogullari, Metin, Van Hoof, Sarah, Vitry, Youen, Dehaeck, Sam, Du Bois, V., Lambert, Pierre, Colinet, Pierre, Seveno, David, and Van Vuure, A.W.

Abstract

HypothesisThe architecture of complex-shaped fibres affects the motion of the contact line and the evolution of its associated menisci when a fibre is immersed into a liquid. Understanding and predicting the motion of the contact line is critical in the design of complex-shaped fibres for many engineering applications as well as for surface science. While wetting on classic circular cylinders have been well studied, singularities during the wetting process of complex-shaped fibres are not yet well understood.ExperimentsThe dynamic wetting behaviour of axisymmetric sinus-shaped fibres immersed vertically in a liquid volume was investigated. Fibres were 3D-printed down to micrometre dimensions, and the Wilhelmy method was used in parallel with meniscus shape analysis. Moreover, a quasi-static theoretical model predicting the contact line movement and free energy of the system evolution on these fibres is also proposed.FindingsThe observation of liquid advancing and receding fronts highlighted a stick-slip motion of the meniscus depending on both the fibre surface curvature and its intrinsic wettability. The model predicts that the behaviour of the seemingly pinned and then jumping contact line, with associated changes in apparent contact angles, can be explained by the interplay between a constant local contact angle and the movement of the bulk liquid, leading to the storage of energy which is suddenly released when the contact line passes a given point of fibre curvature. Besides, acceleration/deceleration events that take place before and after the jumps are experimentally observed in good agreement with the model., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2019

6. Contact line stick-slip motion and meniscus evolution on micrometer-size wavy fibres

Author

Fuentes, Carlos C.A., Hatipogullari, Metin, Van Hoof, S., Vitry, Youen, Dehaeck, Sam, Du Bois, V., Lambert, Pierre, Colinet, Pierre, Seveno, David, Van Vuure, Aart Willem, Fuentes, Carlos C.A., Hatipogullari, Metin, Van Hoof, S., Vitry, Youen, Dehaeck, Sam, Du Bois, V., Lambert, Pierre, Colinet, Pierre, Seveno, David, and Van Vuure, Aart Willem

Abstract

Hypothesis: The architecture of complex-shaped fibres affects the motion of the contact line and the evolution of its associated menisci when a fibre is immersed into a liquid. Understanding and predicting the motion of the contact line is critical in the design of complex-shaped fibres for many engineering applications as well as for surface science. While wetting on classic circular cylinders has been well studied, singularities during the wetting process of complex-shaped fibres are not yet well understood. Experiments: The dynamic wetting behaviour of axisymmetric sinus-shaped fibres immersed vertically in a liquid volume was investigated. Fibres were 3D-printed down to micrometre dimensions, and the Wilhelmy method was used in parallel with meniscus shape analysis. Moreover, a quasi-static theoretical model predicting the contact line movement and free energy of the system evolution on these fibres is also proposed. Findings: The observation of liquid advancing and receding fronts highlighted a stick-slip motion of the meniscus depending on both the fibre surface curvature and its intrinsic wettability. The model predicts that the behaviour of the seemingly pinned and then jumping contact line, with associated changes in apparent contact angles, can be explained by the interplay between a constant local contact angle and the movement of the bulk liquid, leading to the storage of energy which is suddenly released when the contact line passes a given point of fibre curvature. Besides, acceleration/deceleration events that take place before and after the jumps are experimentally observed in good agreement with the model., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2019

11. Phase diagrams of one-dimensional half-filled two-orbital SU(N) cold fermion systems.

Author

Bois, V., Capponi, S., Lecheminant, P., Moliner, M., and Totsuka, K.

Subjects
*PHASE diagrams, *ONE-dimensional conductors, *ATOMIC orbitals, *FERMIONS, *EXOTIC atoms
Abstract

We investigate possible realizations of exotic SU(N) symmetry-protected topological (SPT) phases with alkaline-earth cold fermionic atoms loaded into one-dimensional optical lattices. A thorough study of two-orbital generalizations of the standard SU(N) Fermi-Hubbard model, directly relevant to recent experiments, is performed. Using state-of-the-art analytical and numerical techniques, we map out the zero-temperature phase diagrams at half-filling and identify several Mott-insulating phases. While some of them are rather conventional (nondegenerate, charge-density wave, or spin-Peierls-like), we also identify, for even N, two distinct types of SPT phases: an orbital Haldane phase, analogous to a spin-N/2 Haldane phase, and a topological SU(N) phase, which we fully characterize by its entanglement properties. We also propose sets of nonlocal order parameters that characterize the SU(N) topological phases found here. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results