The paper fully solves competing instabilities in a Fermi gas with single-wavelength cavity-induced interactions, showing density-wave dominance for attractive cases, non-superradiant superfluids for repulsive cases, and always-deformed Fermi surfaces.
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A general quantity from Landau free energy shows superradiant transitions can enhance or suppress fermionic pairing and superconducting gaps in two-order-parameter systems, as verified in Rabi and Dicke models.
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The fate of the Fermi surface coupled to a single-wave-vector cavity mode
The paper fully solves competing instabilities in a Fermi gas with single-wavelength cavity-induced interactions, showing density-wave dominance for attractive cases, non-superradiant superfluids for repulsive cases, and always-deformed Fermi surfaces.
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Superradiance enhances and suppresses fermionic pairing based on universal critical scaling in two order parameters systems
A general quantity from Landau free energy shows superradiant transitions can enhance or suppress fermionic pairing and superconducting gaps in two-order-parameter systems, as verified in Rabi and Dicke models.