Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
- URL: http://arxiv.org/abs/2312.13960v3
- Date: Tue, 9 Apr 2024 21:59:15 GMT
- Title: Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
- Authors: Théo Malas-Danzé, Alexandre Dugelay, Nir Navon, Hadrien Kurkjian,
- Abstract summary: 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 off-diagonal long-range order is directly reflected in the behavior of the interferometric signal for long interrogation times.
- Score: 41.94295877935867
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: 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.
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