Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866929442058665984 |
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| author | Malas-Danzé, Théo Dugelay, Alexandre Navon, Nir Kurkjian, Hadrien |
| author_facet | Malas-Danzé, Théo Dugelay, Alexandre Navon, Nir Kurkjian, Hadrien |
| contents | We propose an interferometric method to probe pair correlations in a gas of spin-1/2 fermions. The method consists of a Ramsey sequence where both spin states of the Fermi gas are set in a superposition of a state at rest and a state with a large recoil velocity. The two-body density matrix is extracted via the fluctuations of the transferred fraction to the recoiled state. In the pair-condensed phase, the off-diagonal long-range order is directly reflected in the asymptotic behavior of the interferometric signal for long interrogation times. The method also allows to probe the spatial structure of the condensed pairs: the interferometric signal is an oscillating function of the interrogation time in the Bardeen-Cooper-Schrieffer regime; it becomes an overdamped function in the molecular Bose-Einstein condensate regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_13960 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry Malas-Danzé, Théo Dugelay, Alexandre Navon, Nir Kurkjian, Hadrien Quantum Gases Statistical Mechanics Atomic Physics Quantum Physics We propose an interferometric method to probe pair correlations in a gas of spin-1/2 fermions. The method consists of a Ramsey sequence where both spin states of the Fermi gas are set in a superposition of a state at rest and a state with a large recoil velocity. The two-body density matrix is extracted via the fluctuations of the transferred fraction to the recoiled state. In the pair-condensed phase, the off-diagonal long-range order is directly reflected in the asymptotic behavior of the interferometric signal for long interrogation times. The method also allows to probe the spatial structure of the condensed pairs: the interferometric signal is an oscillating function of the interrogation time in the Bardeen-Cooper-Schrieffer regime; it becomes an overdamped function in the molecular Bose-Einstein condensate regime. |
| title | Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry |
| topic | Quantum Gases Statistical Mechanics Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2312.13960 |