Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
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.
Keywords
Cite
@article{arxiv.2312.13960,
title = {Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry},
author = {Théo Malas-Danzé and Alexandre Dugelay and Nir Navon and Hadrien Kurkjian},
journal= {arXiv preprint arXiv:2312.13960},
year = {2024}
}
Comments
6 pages, 3 figures