Results 91 to 100 of about 8,731 (217)
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 +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 +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. +6 more
core +2 more sources
BCS–BEC crossover in spatially modulated fermionic condensates [PDF]
Journal of Physics: Conference Series, 2011 Several novel multi-component fermionic condensates show universal behavior under imbalance in the number of fermionic species. Here I discuss their phase structure, thermodynamics, and the transition from the weak (BCS) to strong (BEC) coupling regime.
openaire +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 +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 +5 more
core +1 more source
Functional renormalization group approach to the BCS‐BEC crossover [PDF]
Annalen der Physik, 2010 AbstractThe phase transition to superfluidity and the BCS‐BEC crossover for an ultracold gas of fermionic atoms is discussed within a functional renormalization group approach. Non‐perturbative flow equations, based on an exact renormalization group equation, describe the scale dependence of the flowing or average action.
Diehl, Sebastian +4 more
openaire +3 more sources
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 +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
Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas [PDF]
Physical review B, 2019 We investigate Bardeen-Cooper-Schrieffer (BCS)- Bose-Einstein condensation (BEC) crossover in a two-band superfluid Fermi gas with an energy shift between the bands.
Yuriy Yerin +3 more
semanticscholar +1 more source