Results 111 to 120 of about 8,731 (217)

Cooper pair polaritons in cold fermionic atoms within a cavity

Physical Review Research, 2020
We formulate a Bardeen-Cooper-Schriffer (BCS) theory of quasiparticles in a degenerate Fermi gas strongly coupled to photons in a optical cavity. The elementary photonic excitations of the system are cavity polaritons, which consist of a cavity photon ...
Amaury Dodel, Alexander Pikovski, Igor Ermakov, Marek Narozniak, Valentin Ivannikov, Haibin Wu, Tim Byrnes   +6 more
doaj   +1 more source

Dispersion and Damping of Phononic Excitations in Fermi Superfluid Gases in 2D

Condensed Matter, 2020
We calculate the sound velocity and the damping rate of the collective excitations of a 2D fermionic superfluid in a non-perturbative manner. Specifically, we focus on the Anderson−Bogoliubov excitations in the BEC-BCS crossover regime, as these ...
Lars-Paul Lumbeeck, Jacques Tempere, Serghei Klimin   +2 more
doaj   +1 more source

Sound modes at the BCS-BEC crossover [PDF]

Physical Review A, 2006
First and second sound speeds are calculated for a uniform superfluid gas of fermi atoms as a function of temperature, density and interaction strength. The second sound speed is of particular interest as it is a clear signal of a superfluid component and it determines the critical temperature.
openaire   +2 more sources

Superconductor-Insulator Transition and Fermi-Bose Crossovers

Physical Review X, 2016
The direct transition from an insulator to a superconductor (SC) in Fermi systems is a problem of long-standing interest, which necessarily goes beyond the standard BCS paradigm of superconductivity as a Fermi surface instability.
Yen Lee Loh, Mohit Randeria, Nandini Trivedi, Chia-Chen Chang, Richard Scalettar   +4 more
doaj   +1 more source

Multiple period states of the superfluid Fermi gas in an optical lattice

New Journal of Physics, 2016
We study multiple period states of a two-component unpolarized superfluid Fermi gas in an optical lattice along the Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein condensate (BEC) crossover.
Sukjin Yoon, Franco Dalfovo, Takashi Nakatsukasa, Gentaro Watanabe   +3 more
doaj   +1 more source

BCS-BEC Crossover in Symmetric Nuclear Matter at Finite Temperature: Pairing Fluctuation and Pseudogap

, 2010
By adopting a $T$-matrix based method within $G_0G$ approximation for the pair susceptibility, we studied the effects of pairing fluctuation on the BCS-BEC crossover in symmetric nuclear matter.
A. A. Isayev, A. J. Leggett, A. L. Fetter, P. Ring, Xu-Guang Huang   +4 more
core   +1 more source

Diversified vortex phase diagram for a rotating trapped two-band Fermi gas in the BCS-BEC crossover

New Journal of Physics, 2018
We report the equilibrium vortex phase diagram of a rotating two-band Fermi gas confined to a cylindrically symmetric parabolic trapping potential, using the recently developed finite-temperature effective field theory (Klimin et al 2016 Phys. Rev.
S N Klimin, J Tempere, M V Milošević
doaj   +1 more source

Strong pairing in two dimensions: pseudogaps, domes, and other implications

New Journal of Physics, 2020
This paper addresses the transition from the normal to the superfluid state in strongly correlated two dimensional fermionic superconductors and Fermi gases.
Xiaoyu Wang, Qijin Chen, K Levin
doaj   +1 more source

Crossovers in Unitary Fermi Systems

, 2010
Universality and crossover is described for attractive and repulsive interactions where, respectively, the BCS-BEC crossover takes place and a ferromagnetic phase transition is claimed.
A. Bohr, A. Bohr, A. Griffin, B. DeMarco, B.A. Gelman, B.M. Andersen, C.A. Regal, C.J. Pethick, C.J. Pethick, D. Poilblanc, D.-H. Kim, D.M. Eagles, D.S. Petrov, E. Arrigoni, E. Berg, E. Burovski, E. Burovski, E. Stoner, E.H. Lieb, F. Marsiglio, F. Pistolesi, F. Werner, F.C. Zhang, G-B. Jo, G. Baym, G. Baym, G.A. Baker, G.E. Astrakharchik, G.M. Bruun, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H. Heiselberg, H.J. Schulz, I. Bloch, I.B. Spielman, J. Bardeen, J. Carlson, J. Carlson, J. Dobaczewski, J. Zaanen, J.-P. Martikainen, J.M. Tranquada, J.Y. Gan, K.A. Brueckner, K.E. Strecker, K.M. O’Hara, L.P. Gorkov, M. Cozzini, M. Fisher, M. Houbiers, M. Kitagawa, M. Köhl, M. Vojta, M.G. Alford, N.D. Mermin, N.N. Bogoliubov, P. Nozières, P. Pieri, P.G.J. Dongen, P.G.J. Dongen, P.W. Anderson, Q. Chen, R. Haussmann, R. Micnas, R. Micnas, R. Staudt, S. Cowell, S. Fölling, S. Jonsell, S. Nascimbene, S. Tan, S.R. White, T. Bourdel, T. Pruschke, T. Rom, T. Schaefer, T.-L. Ho, T.B. Ottenstein, T.D. Lee, U. Schneider, V. Efimov, V.A. Belyakov, V.J. Emery, V.R. Pandharipande, V.R. Pandharipande, V.R. Pandharipande, V.R. Pandharipande, W. Hofstetter, Y. Nishida, Y.J. Uemura, Z. Hadzibabic, Z. Yu   +101 more
core   +1 more source

Extracting the condensate density from projection experiments with Fermi gases

, 2005
A debated issue in the physics of the BCS-BEC crossover with trapped Fermi atoms is to identify characteristic properties of the superfluid phase. Recently, a condensate fraction was measured on the BCS side of the crossover by sweeping the system in a ...
Perali, A., Pieri, P., Strinati, G. C.
core   +1 more source