Quantum spin Hall effect induced by non-magnetic and magnetic staggered potentials

Details Quantum spin Hall effect induced by non-magnetic and magnetic staggered potentials Quantum spin Hall effect induced by non-magnetic and magnetic staggered potentials

2011-01-21

arxiv.org/abs/1101.4064v2

Phys. Rev. B 83, 045114 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures. PRB in press

Scientific paper

We have a comparative study of the quantum spin Hall (QSH) effects induced by non-magnetic and magnetic staggered potentials respectively and show that they have the same effect in driving the topological phase transition. The result implies that both time-reversal (${\cal T}$) preserving and breaking systems can host QSH effect. We also investigate the stability of the resulting QSH effect to disorder and find that for ${\cal T}$ invariant system the edge states are always robust while those of ${\cal T}$ breaking system are also robust if there is additional symmetry in the system.

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