Mutual dipolar drag in a bilayer Fermi gas

TL;DR

This paper investigates the momentum transfer and transport properties in a double-layer dipolar Fermi gas, revealing a critical distance for stability and analyzing collective density fluctuation modes.

Contribution

It introduces a detailed theoretical analysis of interlayer dipolar interactions and stability criteria using Hubbard and RPA approximations in a bilayer Fermi gas.

Findings

Identification of a critical layer separation distance for system stability

Calculation of the interlayer drag rate as a function of temperature and separation

Analysis of collective modes related to density fluctuations

Abstract

We consider two-dimensional spin-polarized dipolar Fermi gases confined in a double-layer system and calculate the momentum transfer between the layers as a function of temperature to investigate the transport properties of the system. We use the Hubbard approximation to describe the correlation effects and the screening between the dipoles within a single layer. The effective interlayer interaction between the dipoles across the layers is obtained by the random-phase approximation. We calculate the interaction strength and the layer separation distance dependence of the drag rate, and we show that there is a critical distance below which the system is unstable. In addition, we calculate the typical behavior of the collective modes related to the density fluctuations.