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Superradiance of Degenerate Fermi Gases in a Cavity


Interactions between light and matter lie at the very fundamental level of our physical world. The introduction of atomic gases into optical cavities opens the prospect of realizing effective long-range interatomic interactions via the mediation of cavity fields. We consider a degenerate Fermi gas placed inside a cavity and study the critical strength of pumping field for driving a superradiance transition, through which a charge density wave order of the Fermi gases emerges. For a single component Fermi gas, we find that Fermi surface nesting effect strongly enhances the superradiance tendency [1]. We further study a two-component Fermi gas in a cavity near a Feshbach resonance. We show that as the two-component Fermi gas passes through the BEC-BCS crossover, the superradiant phase transition undergoes a corresponding crossover from a fermionic behavior on the weakly interacting BCS side, to a bosonic behavior on the molecular BEC side [2].
[1] Yu Chen, Zhenhua Yu, and Hui Zhai, Phys. Rev. Lett. 112, 143004 (2014)
[2] Yu Chen, Hui Zhai, and Zhenhua Yu, Phys. Rev. A 91, 021602 (R) (2015)