Superradiance of Degenerate Fermi Gases in a Cavity

Zhenhua Yu (Tsinghua University)
Event Date and Time: 
Mon, 2014-04-28 12:00 - 13:00
Hennings 318
The interaction between matter and electromagnetic field is the most fundmental and of widest applications at the energy scales relevant to human beings. Electromagnetic field in cavities has its own characteristics. We consider spinless Fermi gases placed inside a cavity. Due to the interaction between the Fermi gases and the cavity field, a superradiance transition occurs in the system when the pumping laser field applied on the fermions reaches a critical strength. We discover that Fermi surface nesting effect can strongly enhance the superradiance tendency in comparison to a Bose gas of same density. This feature leads to interesting reentrance behavior and topologically distinct structure in the phase diagram. Away from the Fermi surface nesting regime, 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.
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