Two-band superfluidity and intrinsic Josephson effect in alkaline-earth Fermi gases across an orbital Feshbach resonance
arXiv:1605.00470 · doi:10.1103/PhysRevA.94.011604
Abstract
We first show that the many-body Hamiltonian governing the physical properties of an alkaline-earth Yb-173 Fermi gas across the recently-realized orbital Feshbach resonance is exactly analogous to that of two-band s-wave superconductors with contact interactions: i.e., even though the free-particle bands have a tunable energy offset in between and are coupled by a Josephson-type attractive inter-band pair scattering, the intra-band interactions have exactly the same strength. We then introduce two intra-band order parameters within the BCS mean-field approximation, and investigate the competition between their in-phase and out-of-phase (i.e., the so-called π-phase) solutions in the entire BCS-BEC evolution at zero temperature.
5 pages with 3 figures; to appear in PRA as RC
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- Interaction Control of Ultracold Alkaline-Earth Atoms
- Enhanced critical temperature, pairing fluctuation effects, and BCS-BEC crossover in a two-band Fermi gas
- Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas
- Collective Modes in a Two-band Superfluid of Ultracold Alkaline-earth Atoms Close to an Orbital Feshbach Resonance
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- Trapped Yb Fermi gas across an orbital Feshbach resonance
- Mechanism of screening or enhancing the pseudogap throughout the two-band Bardeen-Cooper-Schrieffer to Bose-Einstein condensate crossover
- Constrained weak-coupling superconductivity in multiband superconductors
- Quantum Defect Theory for Orbital Feshbach Resonance
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- Leggett collective excitations in a two-band Fermi superfluid at finite temperatures
- Diversified vortex phase diagram for a rotating trapped two-band Fermi gas in the BCS-BEC crossover
- BCS-BCS crossover between atomic and molecular superfluids in a Bose-Fermi mixture
- Enhanced Fulde-Ferrell-Larkin-Ovchinnikov and Sarma superfluid states near an orbital Feshbach resonance
- Hybrid-pair superfluidity in a strongly driven Fermi gas
- Leggett mode in a two-component Fermi gas with dipolar interactions
- Superfluid properties of an ultracold Fermi gas with an orbital Feshbach resonance in the BCS-BEC crossover region
- Two-band atomic superfluidity in the presence of an orbital Feshbach resonance