Universal transparency and asymmetric spin splitting near the Dirac point in HgTe quantum wells
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TU Wien
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Description
These are the data for the paper:
V. Dziom, A. Shuvaev, J. Gospodarič, E. G. Novik, A. A. Dobretsova, N. N. Mikhailov, Z. D. Kvon, Z. Alpichshev, and A. Pimenov
“Universal transparency and asymmetric spin splitting near the Dirac point in HgTe quantum wells”
Phys. Rev. B 106, 045302 (2022). https://doi.org/10.1103/PhysRevB.106.045302
arXiv:2504.15877
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 "Transmission_Field.oggu" contains the rransmission spectra of circularly polarized radiation at 1.85 K and at 940 GHz. The dark sample demonstrates two resonances at positive magnetic field, corresponding to spin-resolved hole subbands.The illumination shifts the Fermi level to the conduction band with much smaller spin splitting, and electrons produce the single resonance in the negative field.
The file "Absorption_Frequency.oggu" shows the THz absorption in zero magnetic field as extracted from field dependence of the transmission at fixed frequencies.
The file "Conductivity_Mass.oggu" shows:
a) Optical conductivity for the hole resonences, demonstrating the universal value πα/2 upon passing through zero magnetic field.
b) Cyclotron masses determined from positions of the two hole and one electron resonances, respectively.
Abstract
Spin-orbit coupling in thin HgTe quantum wells results in a relativistic-like electron band structure, making it a versatile solid state platform to observe and control nontrivial electrodynamic phenomena. Here we report an observation of universal terahertz (THz) transparency determined by fine-structure constant α ≈ 1/137 in 6.5-
nm-thick HgTe layer, close to the critical thickness separating phases with topologically different electronic band structure. Using THz spectroscopy in a magnetic field we obtain direct evidence of asymmetric spin splitting of the Dirac cone. This particle-hole asymmetry facilitates optical control of edge spin currents in the quantum wells.
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- Dataset: 10.1103/PhysRevB.106.045302 (DOI)