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Realistic picture of helical edge states in HgTe quantum wells

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arxiv 1712.04406 v2 pith:6VPOJ2C7 submitted 2017-12-12 cond-mat.mes-hall cond-mat.mtrl-sci

S. S. Krishtopenko , F. Teppe This is my paper
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords edgehgtequantumstateshamiltonianhelicalmodelpicture
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We propose a minimal effective two-dimensional Hamiltonian for HgTe/CdHgTe quantum wells (QWs) describing the side maxima of the first valence subband. By using the Hamiltonian, we explore the picture of helical edge states in tensile and compressively strained HgTe QWs. We show that both dispersion and probability density of the edge states can differ significantly from those predicted by the Bernevig-Hughes-Zhang (BHZ) model. Our results pave the way towards further theoretical investigations of HgTe-based quantum spin Hall insulators with direct and indirect band gaps beyond the BHZ model.

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