Fermi-pressure-assisted cavity superradiance in a mesoscopic Fermi gas

• URL: http://arxiv.org/abs/2603.08691v1
• Date: Mon, 09 Mar 2026 17:54:16 GMT
• Title: Fermi-pressure-assisted cavity superradiance in a mesoscopic Fermi gas
• Abstract summary: We study the superradiant phase transition of a mesoscopic Fermi gas across a wide range of densities.<n>We observe a non-monotonic variation of the superradiant threshold as a function of density.<n>We demonstrate the operation of our mesoscopic system in a regime where light-induced forces are opposite for the two spin components.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the superradiant phase transition of a mesoscopic Fermi gas comprising between a few tens and a few thousand $^6$Li atoms in a high-finesse cavity across a wide range of densities. We observe a non-monotonic variation of the superradiant threshold as a function of density, with a minimum reached when the Fermi and recoil wavevectors are comparable. The minimum corresponds to a crossover between Fermi pressure-assisted ordering and Pauli blocking of photon scattering, in good agreement with theory. This interpretation is confirmed by a study of the atom-number dependence of the ordering threshold and photon number scaling. Lastly, we demonstrate the operation of our mesoscopic system in a regime where light-induced forces are opposite for the two spin components, leading to an ordered phase with a spin-density-wave character. Our system opens the perspective of studying few-fermion systems with strong and coherent light-matter coupling.

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