Interlayer superfluidity in bilayer systems of fermionic polar molecules

TL;DR

This paper explores the emergence of interlayer superfluidity in bilayer systems of fermionic polar molecules, demonstrating a tunable BCS-BEC crossover achievable with current experimental setups.

Contribution

It introduces a theoretical framework for interlayer superfluidity in bilayer fermionic polar molecules, covering the full BCS-BEC crossover regime.

Findings

Interlayer superfluidity can be realized with current experimental parameters.

The system exhibits a tunable BCS-BEC crossover.

Superfluid regimes include BCS-like pairing and Bose-Einstein condensation of dimers.

Abstract

We consider fermionic polar molecules in a bilayer geometry where they are oriented perpendicularly to the layers, which permits both low inelastic losses and superfluid pairing. The dipole-dipole interaction between molecules of different layers leads to the emergence of interlayer superfluids. The superfluid regimes range from BCS-like fermionic superfluidity with a high $T_c$ to Bose-Einstein (quasi-)condensation of interlayer dimers, thus exhibiting a peculiar BCS-BEC crossover. We show that one can cover the entire crossover regime under current experimental conditions.