Results 51 to 60 of about 5,965 (154)

Analytic approach to transport in superconducting junctions with arbitrary carrier density

Physical Review Research, 2022
Particle transport across junctions between two superconductors is commonly described using a simplifying approximation (often called the Andreev approximation), which assumes that excitations are fixed at the Fermi momentum and only Andreev reflections,
F. Setiawan, Johannes Hofmann
doaj   +1 more source

Low-Lying Collective Excitations of Superconductors and Charged Superfluids

Condensed Matter, 2023
We investigate theoretically the momentum-dependent frequency and damping of low-lying collective excitations of superconductors and charged superfluids in the BCS–BEC crossover regime.
Serghei Klimin, Jacques Tempere, Hadrien Kurkjian   +2 more
doaj   +1 more source

Quantum fluctuations in the BCS-BEC crossover of two-dimensional Fermi gases

, 2015
We present a theoretical study of the ground state of the BCS-BEC crossover in dilute two-dimensional Fermi gases. While the mean-field theory provides a simple and analytical equation of state, the pressure is equal to that of a noninteracting Fermi gas
Cao, Gaoqing, He, Lianyi, Hu, Hui, Liu, Xia-Ji, Lv, Haifeng   +4 more
core   +2 more sources

Motion of a Solitonic Vortex in the BEC-BCS Crossover [PDF]

, 2014
We observe a long-lived solitary wave in a superfluid Fermi gas of $^6$Li atoms after phase-imprinting. Tomographic imaging reveals the excitation to be a solitonic vortex, oriented transverse to the long axis of the cigar-shaped atom cloud.
Cheuk, Lawrence W., Guardado-Sanchez, Elmer, Ji, Wenjie, Ku, Mark J. H., Mukherjee, Biswaroop, Yefsah, Tarik, Zwierlein, Martin W.   +6 more
core   +2 more sources

BEC-BCS crossover in an optical lattice

, 2006
We present the microscopic theory for the BEC-BCS crossover of an atomic Fermi gas in an optical lattice, showing that the Feshbach resonance underlying the crossover in principle induces strong multiband effects.
Arnaud Koetsier, C. A. Regal, D. B. M. Dickerscheid, H. T. C. Stoof   +3 more
core   +1 more source

Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover [PDF]

, 2006
We present the Bogoliubov theory for the Bose-Einstein condensation of Feshbach molecules in a balanced Fermi mixture. Because the Bogoliubov theory includes (Gaussian) fluctuations, we can in this manner accurately incorporate both the two-body and many-
A. J. Leggett, H. T. C. Stoof, M. W. J. Romans, N. N. Bogoliubov, N. N. Bogoliubov, V. M. Galitskii   +5 more
core   +1 more source

Non-equilibrium BCS-BEC crossover and unconventional FFLO superfluid in a strongly interacting driven-dissipative Fermi gas

AAPPS Bulletin
We present a theoretical review of the recent progress in non-equilibrium BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover physics.
Taira Kawamura, Yoji Ohashi
doaj   +1 more source

Properties of the strongly paired fermionic condensates

, 2006
We study a gas of fermions undergoing a wide resonance s-wave BCS-BEC crossover, in the BEC regime at zero temperature. We calculate the chemical potential and the speed of sound of this Bose-condensed gas, as well as the condensate depletion, in the low
A. A. Abrikosov, A. Leggett, G. V. Skorniakov, G. V. Skorniakov, J. Levinsen, L. V. Keldysh, L. V. Keldysh, V. Gurarie, V. N. Efimov, V. N. Popov, V. N. Popov, W. H. Press, Y. B. Rumer   +12 more
core   +1 more source

Ueg Week 2020 Poster Presentations

, 2020
United European Gastroenterology Journal, Volume 8, Issue S8, Page 144-887, October 2020.
wiley   +1 more source

Collective dipole oscillations in a mixture of Bose and Fermi superfluids in the BCS–BEC crossover

New Journal of Physics, 2018
We present a study for the collective dipole oscillations of a mixture of Bose and Fermi superfluids in the crossover from Bardeen–Cooper–Schrieffer (BCS) superfluid to a molecular Bose–Einstein condensate (BEC) in the ENS experimental setup (Ferrier ...
Wen Wen, Hui-jun Li
doaj   +1 more source