Anisotropic Fermi Superfluid via p-wave Feshbach Resonance

TL;DR

This paper provides a theoretical analysis of p-wave Feshbach resonance-induced fermionic superfluidity, revealing how dipole interactions cause anisotropic pairing and phase transitions between different pairing symmetries.

Contribution

It introduces a theoretical model showing how dipole interactions influence anisotropic pairing symmetries and phase transitions in p-wave superfluids.

Findings

Dipole interactions cause extremely anisotropic pairing.

Two pairing symmetries ($k_z$ and $k_z + i eta k_y$) are identified.

A phase transition between these states can be induced by magnetic field or density changes.

Abstract

We investigate theoretically Fermionic superfluidity induced by Feshbach resonance in the orbital p-wave channel. We show that, due to the dipole interaction, the pairing is extremely anisotropic. When this dipole interaction is relatively strong, the pairing has symmetry $k_z$. When it is relatively weak, it is of symmetry $k_z + i \beta k_y$ (up to a rotation about $\hat z$, here $\beta < 1$). A phase transition between these two states can occur under a change in the magnetic field or the density of the gas.