Wednesday, April 17, 2013

1304.4268 (Yi Li et al.)

Spontaneous time-reversal symmetry breaking in the boundary Majorana
flat bands

Yi Li, Da Wang, Congjun Wu
We study the boundary Majorana modes for the single component p-wave weak topological superconductors or superfluids, which form zero energy flat bands protected by time-reversal symmetry. However, due to the divergence of density of states, the band flatness is unstable under spatial variations of Cooper pairing phases, which spontaneously breaks time-reversal symmetry and lifts the degeneracy. Staggered current loops are generated near the boundary forming non-quantized vortices. This effect can appear in both condensed matter and ultra-cold atom systems.
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