Topological Superfluid in P-band Optical Lattice

TL;DR

This paper predicts a novel Z2 topological superfluid phase in p-band fermionic systems with attractive interactions, featuring Majorana edge modes and unique excitations, and discusses potential experimental realization.

Contribution

It introduces a translation symmetry protected Z2 topological superfluid in p-band optical lattices, characterized by fermion parity patterns and supporting Majorana modes.

Findings

Identification of Z2 topological superfluid in p-band systems

Presence of Majorana edge modes in the phase

Discovery of Z2 link-excitations as low energy excitations

Abstract

In this paper by studying p-band fermionic system with nearest neighbor attractive interaction we find translation symmetry protected Z2 topological superfluid (TSF) that is characterized by a special fermion parity pattern at high symmetry points in momentum space k=(0,0), (0,pi), (pi,0), (pi,pi). Such Z2 TSF supports the robust Majorana edge modes and a new type of low energy excitation - (supersymmetric) Z2 link-excitation. In the end we address a possible realization of such interacting p-band fermions with Z2 TSF.