Probing the Band Topology of Mercury Telluride through Weak Localization and Antilocalization
| Autor: | Viktor Krueckl, Klaus Richter |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics FOS: Physical sciences Mercury telluride Fermi energy Heterojunction 530 Physik Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Cadmium telluride photovoltaics Electronic Optical and Magnetic Materials Weak localization chemistry.chemical_compound symbols.namesake chemistry Geometric phase Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Materials Chemistry symbols Electrical and Electronic Engineering Hamiltonian (quantum mechanics) Quantum well |
| Popis: | 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. 7 pages, 6 figures, added references |
| Databáze: | OpenAIRE |
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