Induced interactions for ultracold Fermi gases in optical lattices

Abstract

We investigate the effect of optical lattices on the BCS superfluidity by using the Gorkov--Melik-Barkhudarov (GMB) correction for a two-component Fermi gas. We find that the suppression of the order parameter is strongly enhanced by the lattice effects. The predictions made by the GMB corrections are in qualitative and, for the cases studied, quantitative agreement with previous quantum Monte Carlo results. We discuss how the GMB correction extends the validity of the mean-field theory to a wider range of tunable optical lattice systems in different dimensions.

4 pages, 4 figures

References in corpus (10)

• Many-Body Physics with Ultracold Gases
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Theory of ultracold Fermi gases
• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
• Spin-1/2 fermions on spin-dependent optical lattices
• FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
• Renormalization group flow for fermionic superfluids at zero temperature
• Superfluid pairing between fermions with unequal masses
• Co-existence and shell structures of several superfluids in trapped three-component Fermi mixtures

Cited by in corpus (4)

• Pseudogap phenomena in ultracold atomic Fermi gases
• Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling
• The Gor'kov and Melik-Barkhudarov correction to an imbalanced Fermi gas in the presence of impurities
• Comment on Influence of induced interactions on superfluid properties of quasi-two-dimensional dilute Fermi gases with spin-orbit coupling