BCS-BEC crossover in a random external potential

Abstract

We investigate the ground state properties of a disordered superfluid Fermi gas across the BCS-BEC (Bose Einstein condensate) crossover. We show that, for weak disorder, both the depletion of the condensate fraction of pairs and the normal fluid density exhibit a nonmonotonic behavior as a function of the interaction parameter $1/k_{F}a$, reaching their minimum value near unitarity. We find that, moving away from the weak coupling BCS regime, Anderson's theorem ceases to apply and the superfluid order parameter is more and more affected by the random potential.

Revised version, one reference added, Phys. Rev. Lett. in press

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Cited by in corpus (25)

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• Disordered quantum gases under control
• Anderson localization in Bose-Einstein condensates
• Opposite effect of spin-orbit coupling on condensation and superfluidity
• Localization of Bogoliubov quasiparticles in interacting Bose gases with correlated disorder
• Anderson localization of pairs in bichromatic optical lattices
• Transport regimes of cold gases in a two-dimensional anisotropic disorder
• Stability of the superfluid state in a disordered 1D ultracold fermionic gas
• Superfluid to Bose-glass transition of hard core bosons in one-dimensional incommensurate optical lattice
• Direct Observation of Fragmentation in a Disordered, Strongly Interacting Fermi Gas
• Systematic investigation of the effects of disorder at the lowest order throughout the BCS-BEC crossover
• The evolution from BCS to BEC superfluidity in the presence of disorder
• Lattice modulation spectroscopy of strongly interacting bosons in disordered and quasi-periodic optical lattices
• Superfluid-insulator transition and BCS-BEC crossover in dirty ultracold Fermi gas
• Ground-state and dynamic properties of hard-core bosons in one-dimensional incommensurate optical lattices with harmonic trap
• Dipole oscillations of fermionic superfluids along the BEC-BCS crossover in disordered potentials
• Superfluid fraction in the crystalline crust of a neutron star: role of BCS pairing
• Impurity effects on BCS-BEC crossover in ultracold atomic Fermi gases
• Effect of Disorder in BCS-BEC Crossover
• Two-body mobility edge in the Anderson-Hubbard model in three dimensions: Molecular versus scattering states
• Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
• Quenched disorder and the BCS-BEC crossover in the Hubbard model
• Investigating Dirty Crossover through Fidelity Susceptibility and Density of States
• Effect of Weak Disorder on the BCS-BEC crossover in a two-dimensional Fermi Gas
• Self-consistent inclusion of disorder in the BCS-BEC crossover near the critical temperature