https://doi.org/10.1140/epjb/e2016-70585-4
Regular Article
Majorana modes and topological superfluids for ultracold fermionic atoms in anisotropic square optical lattices
1 School of Science, Xi’an Technological University, Xi’an
710032, P.R. China
2 Department of Physics, Beijing Normal
University, Beijing
100875, P.R.
China
a e-mail: wuyajie@xatu.edu.cn
Received:
3
October
2016
Received in final form:
23
October
2016
Published online:
21
December
2016
Motivated by the recent experimental realization of two-dimensional spin-orbit coupling through optical Raman lattice scheme, we study attractive interacting ultracold gases with spin-orbit interaction in anisotropic square optical lattices, and find that rich s-wave topological superfluids can be realized, including Z2 topological superfluids beyond the characterization of “tenfold way” in addition to chiral topological superfluids. The topological defects-superfluid vortex and edge dislocations-may host Majorana modes in some topological superfluids, which are helpful for realizing topological quantum computation and Majorana fermionic quantum computation. In addition, we also discuss the Berezinsky-Kosterlitz-Thouless phase transitions for different topological superfluids.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2016