Enhancement of fermionic superradiance in unbalanced double-cavity systems
Phys. Rev. A 113, 013707 – Published 2 January, 2026
DOI: https://doi.org/10.1103/dmx2-d5w2
Abstract
We investigate the superradiant phase transition of a Fermi gas in a double-cavity systems with unbalanced decay rates. By self-consistently solving the steady-state equation for the cavity fields via a mean-field approach, we determine the superradiant phase diagram for low particle filling. By comparing with the case where only one cavity is present, we show that in a double-cavity system, if superradiance is already established in one cavity, the other cavity is more likely to enter the superradiant phase. This phenomenon is explained by calculating the density of states at the Fermi surface and the effective pumping strength experienced by the atoms. The results show that although the density of states is suppressed when superradiance is built in one cavity, the spatial redistribution of fermions in the cavity field significantly enhances the effective pumping strength of the other cavity, thereby facilitating its transition to the superradiant phase.
