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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...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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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. |
format | Online Article Text |
id | pubmed-9324450 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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