Topological superfluid of spinless Fermi gases in p-band honeycomb optical lattices with on-site rotation
1 Department of Experiment Teaching, Yancheng Institute of Technology - Yancheng, 224051, China
2 Institute for Theoretical Physics and Department of Modern Physics, University of Science and Technology of China - Hefei, 230026, China
Received: 27 June 2012
Accepted: 20 September 2012
In this letter, we put forward another way for 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 TSs are also possible.
PACS: 67.85.Lm – Degenerate Fermi gases / 03.65.Vf – Phases: geometric; dynamic or topological / 74.20.-z – Theories and models of superconducting state
© EPLA, 2012