# Fulde-Ferrell-Larkin-Ovchinnikov state in bilayer dipolar systems

## TL;DR

This paper investigates the phase diagram of bilayer fermionic polar molecules, revealing how long-range dipolar interactions promote the FFLO state with stripe order under density imbalance.

## Contribution

It demonstrates that long-range dipolar interactions enhance the FFLO phase and enable mixed s-wave and p-wave pairing in bilayer systems.

## Key findings

- FFLO state appears with stripe order at high imbalance
- Long-range dipolar interactions expand the FFLO regime
- Mixed s-wave and p-wave pairing is possible due to dipolar interactions

## Abstract

We study the phase diagram of fermionic polar molecules in a bilayer system, with an imbalance of molecular densities of the layers. For the imbalance exceeding a critical value the system undergoes a transition from the uniform interlayer superfluid to the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state with a stripe structure, and at sufficiently large imbalance a transition from the FFLO to normal phase. Compared to the case of contact interactions, the FFLO regime is enhanced by the long-range character of the interlayer dipolar interaction, which can combine the s-wave and p-wave pairing in the order parameter.