Superradiant Phase Transition of Fermi Gases in a Cavity across a Feshbach Resonance

Abstract

In this letter we consider the superradiant phase transition of a two-component Fermi gas in a cavity across a Feshbach resonance. It is known that quantum statistics plays a crucial role for the superradiant phase transition in atomic gases; in contrast to bosons, in a Fermi gas this transition exhibits strong density dependence. We show that across a Feshbach resonance, while 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. This intricate statistics crossover makes the superradiance maximally enhanced either in the unitary regime for low densities, in the BCS regime for moderate densities close to Fermi surface nesting, or in the BEC regime for high densities.

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Cited by in corpus (17)

• Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics
• Quantum Phase Transitions of the Bose-Hubbard Model inside a Cavity
• Superradiance induced particle flow via dynamical gauge coupling
• Density-wave ordering in a unitary Fermi gas with photon-mediated interactions
• Strongly correlated Fermions strongly coupled to light
• Cavity-induced superconducting and $4k_F$ charge-density-wave states
• Antiferromagnetic self-ordering of a Fermi gas in a ring cavity
• Anomalous Diffusion in a Dynamical Optical Lattice
• Cavity-assisted preparation and detection of a unitary Fermi gas
• Dissipative time evolution of a chiral state after a quantum quench
• Non-equilibrium phases of Fermi gas inside a cavity with imbalanced pumping
• Emergent Symmetry at Superradiance Transition of a Bose Condensate in Two Crossed Beam Cavities
• Fluctuation-Induced Bistability of Fermionic Atoms Coupled to a Dissipative Cavity
• Superradiant phase transitions in one-dimensional correlated Fermi gases with cavity-induced umklapp scattering
• The Single Particle Excitation Spectrum of Degenerate Fermi gases in a ring cavity
• Phase transition, phase separation and mode softening of a two-component Bose-Einstein condensate in an optical cavity
• Tuning Density and Spin Ordering of Degenerate Fermi Gases in an Optical Cavity