High-momentum tail and universal relations of a Fermi gas near a Raman-dressed Feshbach resonance

TL;DR

This paper explores universal relations and high-momentum behavior in a Fermi gas near a Raman-dressed Feshbach resonance, identifying four key contact parameters that connect microscopic interactions with thermodynamic properties.

Contribution

It introduces a comprehensive set of contacts for describing high-momentum tails in a Raman-dressed Fermi gas, extending universal relations to include center-of-mass-momentum-dependent interactions.

Findings

Four contacts are identified for high-momentum tails up to q^{-6}.

The q^{-4} tail relates to energy variation with inverse scattering length.

The q^{-5} tail is anisotropic and linked to molecule velocity.

Abstract

In a recent proposal [Jie and Zhang, Phys. Rev. A 95, 060701(R) (2017)], it has been shown that center-of-mass-momentum-dependent two-body interactions can be generated and tuned by Raman coupling the closed-channel bound states in a magnetic Feshbach resonance. Here we investigate the universal relations in a three-dimensional Fermi gas near such a laser modulated $s$-wave Feshbach resonance. Using the operator-product expansion approach, we find that, to fully describe the high-momentum tail of the density distribution up to $q^{-6}$ ($q$ is the relative momentum), four center-of-mass-momentum-dependent parameters are required, which we identify as contacts. These contacts appear in various universal relations connecting microscopic and thermodynamic properties. One contact is related to the variation of energy with respect to the inverse scattering length and determines the leading $q^{-4}$ tail of the high-momentum distribution. Another vector contact appears in the subleading $q^{-5}$ tail, which is related to the velocity of closed-channel molecules. The other two contacts emerge in the $q^{-6}$ tail and are respectively related to the variation of energy with respect to the range parameter and to the kinetic energy of closed-channel molecules. Particularly, we find that the $q^{-5}$ tail and part of the $q^{-6}$ tail of the momentum distribution show anisotropic features. We derive the universal relations and, as a concrete example, estimate the contacts for the zero-temperature superfluid ground state of the system using a mean-field approach.