Two-component fermionic superfluids on a lattice with an external non-Abelian gauge field give access to a variety of topological phases in the presence of a sufficiently large spin imbalance. We address here the important issue of superfluidity breakdown induced by spin imbalance by a self-consistent calculation of the pairing gap, showing which of the predicted phases will be experimentally accessible. We present the full topological phase diagram, and we analyze the connection between Chern numbers and the existence of topologically protected and non-protected edge modes. The Chern numbers are calculated via a very efficient and simple method.
EPL (Europhysics Letters)
- Pub Date:
- November 2010
- Condensed Matter - Superconductivity;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Quantum Physics
- 6 pages, 5 figures to be published in Europhysics Letters