Superradiance of Degenerate Fermi Gases in a Cavity
arXiv:1309.3784 · doi:10.1103/PhysRevLett.112.143004
Abstract
In this letter we consider spinless Fermi gases placed inside a cavity and study the critical strength of pumping field for driving a superradiance transition. We emphasize that Fermi surface nesting effect strongly enhances the superradiance tendency. Around certain fillings, when the Fermi surface is nearly nested with a relevant nesting momentum, the susceptibility of the system toward a checkboard density-wave ordered state is strongly enhanced, because of which a much smaller (sometime even vanishingly small) critical pumping field strength can lead to superradiance. This leads to interesting reentrance behavior and topologically distinct structure in the phase diagram. Away from these fillings, the Pauli exclusion principle brings about the dominant effect for which the critical pumping strength is lowered in the low-density regime and increased in the high-density regime, in comparison to a Bose gas with same density. These results open the prospect of studying rich phenomena of degenerate Fermi gases in cavity.
arXiv comment5 pages, 4 figures, revised version
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