Fermi-pressure-assisted cavity superradiance in a mesoscopic Fermi gas
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2026
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866910046586142720 |
|---|---|
| author | Orsi, Francesca Fedotova, Ekaterina Bhatt, Rohit Prasad Eichenberger, Mae Dubois, Léa Brantut, Jean-Philippe |
| author_facet | Orsi, Francesca Fedotova, Ekaterina Bhatt, Rohit Prasad Eichenberger, Mae Dubois, Léa Brantut, Jean-Philippe |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08691 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Fermi-pressure-assisted cavity superradiance in a mesoscopic Fermi gas Orsi, Francesca Fedotova, Ekaterina Bhatt, Rohit Prasad Eichenberger, Mae Dubois, Léa Brantut, Jean-Philippe Quantum Gases Atomic Physics Quantum Physics 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. |
| title | Fermi-pressure-assisted cavity superradiance in a mesoscopic Fermi gas |
| topic | Quantum Gases Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2603.08691 |