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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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Autores principales: Shuvaev, Alexey, Dziom, Vlad, Gospodarič, Jan, Novik, Elena G., Dobretsova, Alena A., Mikhailov, Nikolay N., Kvon, Ze Don, Pimenov, Andrei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9324450/
https://www.ncbi.nlm.nih.gov/pubmed/35889716
http://dx.doi.org/10.3390/nano12142492
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author Shuvaev, Alexey
Dziom, Vlad
Gospodarič, Jan
Novik, Elena G.
Dobretsova, Alena A.
Mikhailov, Nikolay N.
Kvon, Ze Don
Pimenov, Andrei
author_facet Shuvaev, Alexey
Dziom, Vlad
Gospodarič, Jan
Novik, Elena G.
Dobretsova, Alena A.
Mikhailov, Nikolay N.
Kvon, Ze Don
Pimenov, Andrei
author_sort Shuvaev, Alexey
collection PubMed
description 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 [Formula: see text] 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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spelling pubmed-93244502022-07-27 Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness Shuvaev, Alexey Dziom, Vlad Gospodarič, Jan Novik, Elena G. Dobretsova, Alena A. Mikhailov, Nikolay N. Kvon, Ze Don Pimenov, Andrei Nanomaterials (Basel) Article 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 [Formula: see text] 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. MDPI 2022-07-20 /pmc/articles/PMC9324450/ /pubmed/35889716 http://dx.doi.org/10.3390/nano12142492 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Shuvaev, Alexey
Dziom, Vlad
Gospodarič, Jan
Novik, Elena G.
Dobretsova, Alena A.
Mikhailov, Nikolay N.
Kvon, Ze Don
Pimenov, Andrei
Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
title Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
title_full Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
title_fullStr Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
title_full_unstemmed Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
title_short Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
title_sort band structure near the dirac point in hgte quantum wells with critical thickness
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9324450/
https://www.ncbi.nlm.nih.gov/pubmed/35889716
http://dx.doi.org/10.3390/nano12142492
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