Controlling edge states in the Kane-Mele model via edge chirality

We investigate the dependence of band dispersion of the quantum spin Hall effect (QSHE) edge states in the Kane-Mele model on crystallographic orientation of the edges. Band structures of the one-dimensional honeycomb lattice ribbons show the presence of the QSHE edge states at all orientations of the edges given sufficiently strong spin-orbit interactions. We find that the Fermi velocities of the QSHE edge-state bands increase monotonically when the edge orientation changes from zigzag (chirality angle theta = 0 degrees) to armchair (theta = 30 degrees). We propose a simple analytical model to explain the numerical results. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


Published in:
Physica Status Solidi-Rapid Research Letters, 7, 1-2, 151-153
Year:
2013
Publisher:
Weinheim, Wiley-V C H Verlag Gmbh
ISSN:
1862-6254
Keywords:
Laboratories:




 Record created 2013-10-01, last modified 2018-03-17


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