Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling

TL;DR

This paper investigates how dipolar interactions and Raman-induced spin-orbit coupling influence itinerant ferromagnetism in a Fermi gas, revealing new phase behaviors and potential for experimental observation.

Contribution

It introduces a comprehensive analysis of ferromagnetism in dipolar Fermi gases with spin-orbit coupling, highlighting effects beyond contact interactions and exploring phase degeneracies.

Findings

Dipolar interactions promote ferromagnetism in the system.

Raman coupling suppresses ferromagnetic transition.

Transition temperatures are experimentally accessible.

Abstract

We elucidate the itinerant ferromagnetism of a dipolar Fermi gas with a Raman-induced spin-orbit coupling by investigating the exotic phase diagrams at zero and finite temperature. It is revealed that the dipolar interaction along with spin-orbit coupling can corroborate the formation of ferromagnetism and the Raman coupling adversely eliminates the tendency to this ferromagnetism transition, which greatly transcends the general understanding of this subject with contact interaction only. We explore the ground states through the density and spin-flip distribution in momentum space, which exhibits novel degeneracy at strong Raman coupling indicated by a non-zero entropy at zero temperature. We calculate the transition temperatures well within the reach of an experimental system when altering the dipolar and spin-orbit coupling strength, which paves a way to the further experimental realization.