Orbital Feshbach Resonance: A "Wide" Narrow Resonance for Higher Transition Temperature Fermi Superfluid

Abstract

In this letter we show that the recently theoretically predicted and experimentally observed "orbital Feshbach resonance" in alkali-earth-like Yb-173 atom is a narrow resonance in energy, while it is hundreds Gauss wide in term of magnetic field strength, taking the advantage that the magnetic moment difference between the open and closed channels is quite small. Therefore this is an ideal platform for the experimental realization of a strongly interacting Fermi superfluid with narrow resonance. We show that the transition temperature for the Fermi superfluid in this system, especially at the BCS side of the resonance, is even higher than that in a wide resonance, which is also due to the narrow character of this resonance. Our results will encourage experimental efforts to realize Fermi superfluid in the alkali-earth-like Yb-173 system, the properties of which will be complementary to extensively studied Fermi superfluids nearby a wide resonance in alkali K-40 and Li-6 systems.

10 pages, 5 figures

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• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Resonantly-paired fermionic superfluids
• Spectroscopic observation of SU(N)-symmetric interactions in Sr orbital magnetism
• Multi-channel scattering and Feshbach resonances: Effective theory, phenomenology, and many-body effects
• Two-band superfluidity from the BCS to the BEC limit
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• Quantum Defect Theory for Orbital Feshbach Resonance
• Single-particle Excitations and Strong Coupling Effects in the BCS-BEC Crossover Regime of a Rare-Earth Fermi Gas with an Orbital Feshbach Resonance
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