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arXiv · 1207.1294

Probing the Band Topology of Mercury Telluride through Weak Localization and Antilocalization

Viktor Krueckl·Klaus Richter
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Abstract

We analyze the effect of weak localization (WL) and weak antilocalization (WAL) in the electronic transport through HgTe/CdTe quantum wells. We show that for increasing Fermi energy the magnetoconductance of a diffusive system with inverted band ordering features a transition from WL to WAL and back, if spin-orbit interactions from bulk and structure inversion asymmetry can be neglected. This, and an additional splitting in the magnetoconductance profile, is a signature of the Berry phase arising for inverted band ordering and not present in heterostructures with conventional ordering. In presence of spin-orbit interaction both band topologies exhibit WAL, which is distinctly energy dependent solely for quantum wells with inverted band ordering. This can be explained by an energy-dependent decomposition of the Hamiltonian into two blocks.

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Viktor Krueckl, Klaus Richter. 2012-12-12. Probing the Band Topology of Mercury Telluride through Weak Localization and Antilocalization. https://doi.org/10.1088/0268-1242%2F27%2F12%2F124006

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