Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
Théo Malas-Danzé, Alexandre Dugelay, Nir Navon, Hadrien Kurkjian
SciPost Phys. 17, 024 (2024) · published 29 July 2024
- doi: 10.21468/SciPostPhys.17.1.024
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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.
Cited by 1
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Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 2 Théo Malas-Danzé,
- 1 2 Alexandre Dugelay,
- 1 Nir Navon,
- 3 4 Hadrien Kurkjian
- 1 Yale University
- 2 École normale supérieure Paris-Saclay [ENS Paris-Saclay]
- 3 Laboratoire de Physique Théorique Toulouse [LPT]
- 4 Laboratoire de Physique Théorique de la Matière Condensée / Laboratory of Theoretical Physics of Condensed Matter [LPTMC]