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Universal relations for spin-orbit-coupled Fermi gas near an s-wave resonance

Pengfei Zhang and Ning Sun
Phys. Rev. A 97, 040701(R) – Published 17 April 2018

Abstract

Synthetic spin-orbit-coupled quantum gases have been widely studied both experimentally and theoretically in the past decade. As shown in previous studies, this modification of single-body dispersion will in general couple different partial waves of the two-body scattering and thus distort the wave function of few-body bound states which determines the short-distance behavior of many-body wave function. In this work, we focus on the two-component Fermi gas with one-dimensional or three-dimensional spin-orbit coupling (SOC) near an s-wave resonance. Using the method of effective field theory and the operator product expansion, we derive universal relations for both systems, including the adiabatic theorem, viral theorem, and pressure relation, and obtain the momentum distribution matrix ψa(q)ψb(q) at large q (a,b are spin indices). The momentum distribution matrix shows both spin-dependent and spatial anisotropic features. And the large momentum tail is modified at the subleading order thanks to the SOC. We also discuss the experimental implication of these results depending on the realization of the SOC.

  • Figure
  • Received 25 January 2018

DOI:https://doi.org/10.1103/PhysRevA.97.040701

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Pengfei Zhang and Ning Sun

  • Institute for Advanced Study, Tsinghua University, Beijing 100084, China

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Issue

Vol. 97, Iss. 4 — April 2018

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