Band structure near the Dirac point in HgTe quantum wells with critical thickness
Description
These are the data for the paper:
A. Shuvaev, V. Dziom, J. Gospodarič, E. G. Novik, A. A. Dobretsova, N. N. Mikhailov, Z. D. Kvon, and A. Pimenov
“Band structure near the Dirac point in HgTe quantum wells with critical thickness”
Nanomaterials 12, 2492 (2022). https://doi.org/10.3390/nano12142492
File format: "OriginPro" (OriginLab Corporation)
For the free Viewer, see the link: https://www.originlab.com/viewer/ . All the necessary information is in the Q&A section.
The file "Cyclotron_Resonance_HgTe.oggu" provides the magneto-transmission of a circularly polarized light in HgTe quantum wells with critical
thickness at T = 1.8K and n = 950 GHz. Sample #1 was measured as function of the gate voltage, sample #2 as function of the illumination time, with the charge density is varied via light illumination. Negative and positive magnetic fields correspond to negatively and positively charged quasiparticles, respectively. Acronyms: D.E.—Dirac electrons, D.H.—Dirac holes, M.H.— massive holes (see text for details).
The file "Mass_Density.oggu" provides the parameters of the charge carriers as extracted from the Drude fits of the cyclotron resonance.
The file "Band_Structure_HgTe.oggu" shows the band structure of HgTe films with critical thickness. Symbols are experimental data from
two samples, lines - kp-theory. The solid and dashed lines are split bands due to asymmetric potential and to bulk inversion asymmetry. The
different slopes for electrons and holes are due to a lifted hole degeneracy. The flattening of the hole dispersion at high values of k is due
to approaching of the hole pockets around k ~ 0.5 1/nm, E ~15meV.
Abstract
These are the data for the paper:
A. Shuvaev, V. Dziom, J. Gospodarič, E. G. Novik, A. A. Dobretsova, N. N. Mikhailov, Z. D. Kvon, and A. Pimenov
“Band structure near the Dirac point in HgTe quantum wells with critical thickness”
Nanomaterials 12, 2492 (2022). https://doi.org/10.3390/nano12142492
Abstract: Mercury telluride (HgTe) thin films with a critical thickness of 6.5nm 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 0.04 m_0 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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- Dataset: 10.3390/nano12142492 (DOI)