p-wave Superfluid Phases of Fermi Molecules in a Bilayer Lattice Array

TL;DR

This paper predicts the emergence of unconventional p-wave superfluid phases in a bilayer lattice of ultracold dipolar Fermi molecules, highlighting phase transitions and experimental conditions for observation.

Contribution

It introduces a mean field model demonstrating stable and metastable p-wave superfluid phases in a bilayer lattice with opposite dipole orientations, revealing phase transitions and coexistence.

Findings

Stable and metastable superfluid phases identified

First order phase transition with phase coexistence observed

Superfluid phases predicted at 0.6 nK in NaK molecules

Abstract

We investigate the emergence of superfluid p=p_x+ip_y phases in an ultracold gas of dipolar Fermi molecules lying in two parallel square lattices in 2D. As shown by a two body study, dipole moments oriented in opposite directions in each layer is the key ingredient in our mean field analysis from which unconventional superfluidity is predicted. The T=0 phase diagram summarizes our findings: Stable and metastable superfluid phases appear as a function of the dipole-dipole interaction coupling parameter. A first order phase transition, and thus a mixture of superfluid phases at different densities, is revealed from the coexistence curves in the metastable region. Our model predicts that these superfluid phases can be observed experimentally at 0.6 nK in molecules of NaK confined in optical lattices of size a =532nm