Ferro-Nematic ground state of the dilute dipolar Fermi gas

TL;DR

This paper predicts a ferro-nematic phase in a two-component dipolar Fermi gas, characterized by magnetization and anisotropic Fermi surfaces, arising from the interplay of long-range dipolar and short-range interactions.

Contribution

It introduces the concept of a ferro-nematic ground state in a dilute dipolar Fermi gas, highlighting the role of long-range dipolar interactions in inducing anisotropic order.

Findings

Ferro-nematic phase exists for certain interaction parameters.

The phase exhibits non-zero magnetization and uniaxial orientational order.

Fermi surfaces are elongated or compressed along the magnetization direction.

Abstract

It is shown that a homogeneous two-component Fermi gas with (long range) dipolar and short-range isotropic interactions has a {\em ferro-nematic} phase for suitable values of the dipolar and short-range coupling constants. The ferro-nematic phase is characterized by having a non-zero magnetization and long range orientational uniaxial order. The Fermi surface of spin up (down) component is elongated (compressed) along the direction of the magnetization.