Band structure of a HgTe-based three-dimensional topological insulator

Gospodarič, Jan; Dziom, V.; Shuvaev, A.; Dobretsova, A. A.; Михайлов, Н. Н.; Квон, З. Д.; Novik, E. G.; Pimenov, A.

doi:10.1103/physrevb.102.115113

Cited by 13 publications

(15 citation statements)

References 41 publications

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“…IV E, varying the total charge density n tot by gate voltage in an asymmetric system results in a variation of the corresponding band structure. While these effects play a major role in thicker samples [17], in our case, the differences between band structures calculated at boundary values of n tot are not significant with the accessible energy resolution. Therefore the experimental results are compared to a single theoretical band structure, that was obtained at a total density n tot = 5 • 10 11 cm −2 , i.e.…”

Section: Band Structure Of Hgte 2d Semimetalmentioning

confidence: 48%

“…The experimental resolution of the CR analysis did not allow to observe the spin-splitting of the H1 band. We note that the steeper slope of the experimental points e 1 at higher energies is probably a result of stronger structure-inversion asymmetry at high gate voltages [17]. At low energies, the carrier type h 1 nicely overlaps with the valence band H2 1 , which are spin-polarized and double-valley degenerate.…”

Section: Band Structure Of Hgte 2d Semimetalmentioning

confidence: 72%

“…For circularly-polarized radiation the Drude model for dynamical conductivity in the quasi-classical approxima-tion [17,25] can be written as:…”

Section: Cyclotron Resonancementioning

confidence: 99%

“…( 2) serves as a convenient demonstration that a resonant response of the system with a single charge carrier is expected in transmission spectra. However, for a proper analysis of the experimental data, we employ a model with multiple carrier types in the system, which also takes into account the reflections inside the substrate, The procedure utilizes similar algebra as described previously [17,27,28].…”

Section: Cyclotron Resonancementioning

confidence: 99%

“…Here we investigate two semimetallic HgTe QWs by the analysis of the cyclotron resonance (CR). Applying the recently established technique [16,17] allows us to directly obtain the band structures of these 2D structures. The analysis of the Shubnikov-de Haas (SdH) oscillations seen in the capacitance of the samples gave additional insight into the properties of the charge carriers in the system, providing the degeneracies of the bands.…”

Section: Introductionmentioning

confidence: 99%

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Energy spectrum of semimetallic HgTe quantum wells

Gospodaric,

Shuvaev,

Mikhailov

et al. 2021

Preprint

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Quantum wells (QWs) based on mercury telluride (HgTe) thin films provide a large scale of unusual physical properties starting from an insulator via a two-dimensional Dirac semimetal to a three-dimensional topological insulator. These properties result from the dramatic change of the QW band structure with the HgTe film thickness. Although being a key property, these energy dispersion relations cannot be reflected in experiments due to the lack of appropriate tools. Here we report an experimental and theoretical study of two HgTe quantum wells with inverted energy spectrum in which two-dimensional semimetallic states are realized. Using magneto-optical spectroscopy at sub-THz frequencies we were able to obtain information about electron and hole cyclotron masses at all relevant Fermi level positions and different charge densities. The outcome is also supported by a Shubnikov-de Haas analysis of capacitance measurements, which allows obtaining information about the degeneracy of the active modes. From these data, it is possible to reconstruct electron and hole dispersion relations. Detailed comparative analysis of the energy dispersion relations with theoretical calculations demonstrates a good agreement, reflecting even several subtle features like band splitting, the second conduction band, and the overlaps between the first conduction and first valence band. Our study demonstrates that the cyclotron resonance experiments can be efficiently used to directly obtain the band structures of semimetallic 2D materials.

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Section: Band Structure Of Hgte 2d Semimetalmentioning

confidence: 48%

Section: Band Structure Of Hgte 2d Semimetalmentioning

confidence: 72%

“…For circularly-polarized radiation the Drude model for dynamical conductivity in the quasi-classical approxima-tion [17,25] can be written as:…”

Section: Cyclotron Resonancementioning

confidence: 99%

Section: Cyclotron Resonancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%