TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.1.024
TI  - Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
PY  - 2024/07/29
UR  - https://scipost.org/SciPostPhys.17.1.024
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 1
SP  - 024
A1  - Malas-Danzé, Théo
AU  - Dugelay, Alexandre
AU  - Navon, Nir
AU  - Kurkjian, Hadrien
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.17.1.024,
	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={SciPost Phys.},
	volume={17},
	pages={024},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.1.024},
	url={https://scipost.org/10.21468/SciPostPhys.17.1.024},
}