TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.16.4.091
TI  - A lattice pairing-field approach to ultracold Fermi gases
PY  - 2024/04/03
UR  - https://scipost.org/SciPostPhys.16.4.091
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 16
IS  - 4
SP  - 091
A1  - Ehmann, Florian
AU  - Drut, Joaquín E.
AU  - Braun, Jens
AB  - We develop a pairing-field formalism for ab initio studies of non-relativistic two-component fermions on a (d+1)-dimensional spacetime lattice. More specifically, we focus on theories where the interaction between the two components can be described by the exchange of a corresponding pairing field. The introduction of a pairing field may indeed be convenient for studies of, e.g., the finite-temperature phase structure and critical behavior of, e.g., ultracold atomic Fermi gases. Moreover, such a formalism allows to directly compute the momentum and frequency dependence of the pair propagator, from which the pair-correlation function can be extracted. For a first illustration of the application of our formalism, we compute the density equation of state and the superfluid order parameter for a gas of unpolarized fermions in (0+1) dimensions by employing the complex Langevin approach to surmount the sign problem.
ER  -

@Article{10.21468/SciPostPhys.16.4.091,
	title={{A lattice pairing-field approach to ultracold Fermi gases}},
	author={Florian Ehmann and Joaquín E. Drut and Jens Braun},
	journal={SciPost Phys.},
	volume={16},
	pages={091},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.16.4.091},
	url={https://scipost.org/10.21468/SciPostPhys.16.4.091},
}