Pseudogap phenomena in ultracold atomic Fermi gases

Q Chen, J Wang - Frontiers of Physics, 2014 - Springer
The pairing and superfluid phenomena in a two-component ultracold atomic Fermi gas is an
analogue of Cooper pairing and superconductivity in an electron system, in particular, the …

Entanglement between pairing and screening in the Gorkov-Melik-Barkhudarov correction to the critical temperature throughout the BCS-BEC crossover

L Pisani, A Perali, P Pieri, GC Strinati - Physical Review B, 2018 - APS
The problem of the theoretical description of the critical temperature T c of a Fermi superfluid
dates back to the work by Gorkov and Melik-Barkhudarov (GMB), who addressed it for a …

Gap equation with pairing correlations beyond the mean-field approximation and its equivalence to a Hugenholtz-Pines condition for fermion pairs

L Pisani, P Pieri, GC Strinati - Physical Review B, 2018 - APS
The equation for the gap parameter represents the main equation of the pairing theory of
superconductivity. Although it is formally defined through a single-particle property …

High-order expansion around BCS theory

G Spada, R Rossi, F Simkovic, R Garioud… - arxiv preprint arxiv …, 2021 - arxiv.org
We demonstrate that summation of connected diagrams to high order starting from a BCS
hamiltonian is a viable generic unbiased approach for strongly correlated fermions in …

Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling

J Lee, DH Kim - Physical Review A, 2017 - APS
We investigate the Gorkov–Melik-Barkhudarov (GM) correction to superfluid transition
temperature in two-dimensional Fermi gases with Rashba spin-orbit coupling (SOC) across …

Fulde-Ferrell-Larkin-Ovchinnikov state in the dimensional crossover between one-and three-dimensional lattices

DH Kim, P Törmä - Physical Review B—Condensed Matter and Materials …, 2012 - APS
We present a full phase diagram for the one-dimensional (1D) to three-dimensional (3D)
crossover of the Fulde-Ferrell–Larkin-Ovchinnikov (FFLO) state in an attractive Hubbard …

Finite-temperature phase diagram of quasi-two-dimensional imbalanced Fermi gases beyond mean field

MA Resende, AL Mota, RLS Farias, H Caldas - Physical Review A—Atomic …, 2012 - APS
We investigate the superfluid transition temperature of quasi-two-dimensional imbalanced
Fermi gases beyond the mean-field approximation, through the second-order (or induced) …

Superfluid density of the ultra-cold Fermi gas in optical lattices

T Paananen - Journal of Physics B: Atomic, Molecular and …, 2009 - iopscience.iop.org
In this paper, we study the superfluid density of the two-component Fermi gas in optical
lattices with population imbalance. Three different types of phases, the BCS state (Bardeen …

Effect of the particle-hole channel on BCS–Bose-Einstein condensation crossover in atomic Fermi gases

Q Chen - Scientific Reports, 2016 - nature.com
Abstract BCS–Bose-Einstein condensation (BEC) crossover is effected by increasing pairing
strength between fermions from weak to strong in the particle-particle channel and has …

Induced Interactions and the Superfluid Transition Temperature<? format?> in a Three-Component Fermi Gas

JP Martikainen, JJ Kinnunen, P Törmä, CJ Pethick - Physical review letters, 2009 - APS
We study many-body contributions to the effective interaction between fermions in a three-
component Fermi mixture. We find that effective interactions induced by the third component …