Properties of spin-polarized impurities -- ferrons, in the unitary Fermi gas

TL;DR

This paper investigates ferrons, a new spin-polarized impurity excitation in the unitary Fermi gas, focusing on how temperature and adiabatic processes influence their formation and properties.

Contribution

It introduces the concept of ferrons in the unitary Fermi gas and analyzes their ground state properties and formation conditions under varying temperature and adiabaticity.

Findings

Ferrons are characterized by a nodal surface of the pairing field surrounding a spin-polarized region.

Temperature affects the generation and stability of ferrons.

Adiabaticity influences the formation process of ferrons.

Abstract

A new excitation mode has been predicted to exist in the unitary Fermi gas. It has a form of a spin-polarized impurity, which was dubbed as ferron. It is characterized by a closed nodal surface of the pairing field surrounding a partially spin-polarized superfluid region, where the phase differs by $\pi$. In this paper, we discuss the effect of temperature on the generation of the ferron and the adiabaticity of the spin-polarizing potential together with ferron's ground state properties.