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

Alexey Shuvaev, Vlad Dziom, Jan Gospodarič, Elena G. Novik, Alena A. Dobretsova, Nikolay N. Mikhailov, Ze Don Kvon, Andrei Pimenov

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

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 presented.) 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.

Язык оригиналаанглийский
Номер статьи2492
ЖурналNanomaterials
Том12
Номер выпуска14
DOI
СостояниеОпубликовано - июл. 2022

Предметные области OECD FOS+WOS

  • 2.1.NS НАНОНАУКА И НАНОТЕХНОЛОГИИ
  • 2.05.PM МАТЕРИАЛОВЕДЕНИЕ, МУЛЬТИДИСЦИПЛИНАРНОЕ
  • 1.03.UB ФИЗИКА, ПРИКЛАДНАЯ
  • 1.04.DY ХИМИЯ, МУЛЬТИДИСЦИПЛИНАРНАЯ

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