Mixed parity pairing in a dipolar gas

TL;DR

This paper demonstrates that fermionic dipoles in a two-layer setup can form mixed parity Cooper pairs with both singlet and triplet components, influenced by dipole orientation and layer separation, revealing new superfluid phases.

Contribution

It introduces the concept of mixed parity pairing in dipolar gases due to non-inversion symmetric interactions and maps the phase diagram including singlet, triplet, and mixed phases.

Findings

Identification of mixed singlet and triplet superfluid phases.

Smooth transition of pair wave function from singlet to triplet.

Potential for experimental observation of mixed parity pairing in dipolar gases.

Abstract

We show that fermionic dipoles in a two-layer geometry form Cooper pairs with both singlet and triplet components, when they are tilted with respect to the normal of the planes. The mixed parity pairing arises because the interaction between dipoles in the two different layers is not inversion symmetric. We use an efficient eigenvalue approach to calculate the zero temperature phase diagram of the system as a function of the dipole orientation and the layer distance. The phase diagram contains purely triplet as well as mixed singlet and triplet superfluid phases. We show in detail how the pair wave function for dipoles residing in different layers smoothly changes from singlet to triplet symmetry as the orientation of the dipoles is changed. Our results indicate that dipolar quantum gases can be used to unambiguously observe mixed parity pairing.