Band Structure Near the Dirac Point in HgTe Quantum Wells with Critical Thickness
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
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.
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.
Details
Original language | English |
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Pages (from-to) | 2492-2501 |
Number of pages | 10 |
Journal | Nanomaterials |
Volume | 12 |
Issue number | 14 |
Publication status | Published - 20 Jul 2022 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
Scopus | 85137358774 |
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Keywords
Research priority areas of TU Dresden
DFG Classification of Subject Areas according to Review Boards
Subject groups, research areas, subject areas according to Destatis
Keywords
- Dirac-Fermionen, Heterostrukturen, Terahertz-Spektroskopie, Dirac fermions, heterostructures, Terahertz spectroscopy