Stabilization of the quantum spin Hall effect by designed removal of time-reversal symmetry of edge states.

Phys Rev Lett

Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.

Published: June 2013

The quantum spin Hall (QSH) effect is known to be unstable to perturbations violating time-reversal symmetry. We show that creating a narrow ferromagnetic region near the edge of a QSH sample can push one of the counterpropagating edge states to the inner boundary of the ferromagnetic region and leave the other at the outer boundary, without changing their spin polarizations and propagation directions. Since the two edge states are spatially separated into different "lanes," the QSH effect becomes robust against symmetry-breaking perturbations.

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http://dx.doi.org/10.1103/PhysRevLett.110.266802DOI Listing

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