Vortex core states in superfluid Fermi-Fermi mixtures with unequal masses

Abstract

We analyze the vortex core states of two-species (mass imbalanced) superfluid fermion mixtures as a function of two-body binding energy in two dimensions. In particular we solve the Bogoliubov-de Gennes equations for a population balanced mixture of ${}^6$Li and ${}^{40}$K atoms at zero temperature. We find that the vortex core is mostly occupied by the light-mass (${}^6$Li) fermions and that the core density of the heavy-mass (${}^{40}$K) fermions is highly depleted. This is in contrast with the one-species (mass balanced) mixtures with balanced populations where an equal amount of density depletion is found at the vortex core for both pseudospin components.

4 pages with 3 figures, published PRA version

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Cited by in corpus (8)

• Superfluidity in nuclear systems and neutron stars
• Quantum Degenerate Mixture of Ytterbium and Lithium Atoms
• Sympathetic cooling in an optically trapped mixture of alkali and spin-singlet atoms
• Double Degenerate Bose-Fermi Mixture of Strontium and Lithium
• Vortex formation in a rotating two-component Fermi gas
• Collective modes in asymmetric ultracold Fermi systems
• Vortex-core structure in a mixture of Bose and Fermi superfluids
• Stability of resonantly interacting heavy-light Fermi mixtures