Topological superfluid of spinless Fermi gases in p-band honeycomb optical lattices with on-site rotation

TL;DR

This paper proposes a new method to realize topological superfluidity in spinless Fermi gases using on-site rotation in p-band honeycomb optical lattices, avoiding the need for spin-orbit coupling or magnetic fields.

Contribution

It introduces on-site rotation as a feasible technique to induce topological superfluidity and explores phase transitions between different topological phases.

Findings

On-site rotation induces a transition from normal to topological superfluid.

Critical on-site rotation suppresses charge density wave order.

Multiple topological superfluid phases are identified.

Abstract

In this paper, we put forward to another route realizing topological superfluid (TS). In contrast to conventional method, spin-orbit coupling and external magnetic field are not requisite. Introducing an experimentally feasible technique called on-site rotation (OSR) into p-band honeycomb optical lattices for spinless Fermi gases and considering CDW and pairing on the same footing, we investigate the effects of OSR on superfluidity. The results suggest that when OSR is beyond a critical value, where CDW vanishes, the system transits from a normal superfluid (NS) with zero TKNN number to TS labeled by a non-zero TKNN number. In addition, phase transitions between different TS are also possible.