Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness

Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness

Mercury telluride (HgTe) thin films with a critical thickness of 6.5 nm are predicted to possess a gapless Dirac-like band structure. We report a comprehensive study on gated and optically doped samples by magnetooptical spectroscopy in the THz range. The quasi-classical analysis of the cyclotron re...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Vol. 12; no. 14; p. 2492
Main Authors: Shuvaev, Alexey, Dziom, Vlad, Gospodarič, Jan, Novik, Elena G., Dobretsova, Alena A., Mikhailov, Nikolay N., Kvon, Ze Don, Pimenov, Andrei
Format: Journal Article
Language:English
Published: Basel MDPI AG 20-07-2022
MDPI
Subjects:
Approximation
Asymmetry
band structure
Band structure of solids
Conductivity
Current carriers
Cyclotron resonance
Dirac fermions
Doping
Magnetic fields
Mercury
Mercury tellurides
Molecular beam epitaxy
Quantum wells
Radiation
Resonance
Spectroscopy
Spectrum analysis
Thickness
Thin films
topological insulators
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Summary:Mercury telluride (HgTe) thin films with a critical thickness of 6.5 nm are predicted to possess a gapless Dirac-like band structure. We report a comprehensive study on gated and optically doped samples by magnetooptical spectroscopy in the THz range. The quasi-classical analysis of the cyclotron resonance allowed the mapping of the band dispersion of Dirac charge carriers in a broad range of electron and hole doping. A smooth transition through the charge neutrality point between Dirac holes and electrons was observed. An additional peak coming from a second type of holes with an almost density-independent mass of around 0.04m0 was detected in the hole-doping range and attributed to an asymmetric spin splitting of the Dirac cone. Spectroscopic evidence for disorder-induced band energy fluctuations could not be detected in present cyclotron resonance experiments.
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ISSN:2079-4991
2079-4991
DOI:10.3390/nano12142492