Electronic, magneto-optical and magneto-transport properties of the topological insulator Sb2Te2Se

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Kovalenko, Y.E. and Yakushev, Michael V and Grebennikov, V. I. and Golvashov, V.A. and Marchenkov, V.V. and Orlita, M and Ponosov, Y.S. and Patrakov, E.I. and Titova, S.G. and Martin, Robert and Kokh, K.A. and Tereshchenko, O.E. and Kuznetsova, T. V. (2025) Electronic, magneto-optical and magneto-transport properties of the topological insulator Sb2Te2Se. Physical Review B: Condensed Matter and Materials Physics, 112 (24). 245114. ISSN 2469-9950 (https://doi.org/10.1103/zbgr-8mvm)

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Abstract

The structural, magneto-optical, and magnetotransport properties as well as the electronic band structure of the bulk crystalline topological insulator (TI) Sb2⁢Te2⁢Se, grown by the vertical Bridgman technique, were studied. The high structural quality of the grown crystals was established by x-ray diffraction and Raman spectroscopy. Angular resolved photoelectron spectroscopy revealed a single Dirac cone with the Dirac point, away from the valence as well as conduction bands, 0.22 eV above the Fermi level. The magnetotransport data exhibited a distinct single-frequency Shubnikov-de Haas oscillation in the magnetic fields above = 10 T. The Lifshitz-Kosevich analysis of the data suggests that this oscillation originates from the Dirac-type states. A sharp fundamental absorption edge in the mid-infrared transmission spectra measured at 4.2 K demonstrated a direct band gap of 0.377 eV located at a momentum of 0.1 Å−1 along the Γ− directions of the Brillouin zone. A two-band model developed for massive Dirac electrons in the bulk of topological insulators with the direct band gap at a non-Г point suggests hyperbolic dispersion relations for the conduction and valence bands displaying the full electron-hole symmetry. Equal magnitude of the electron and hole effective masses ≈ℎ≈0.21⁢0 and factors ≈ℎ≈10 were estimated.

ORCID iDs

Kovalenko, Y.E., Yakushev, Michael V, Grebennikov, V. I., Golvashov, V.A., Marchenkov, V.V., Orlita, M, Ponosov, Y.S., Patrakov, E.I., Titova, S.G., Martin, Robert ORCID logoORCID: https://orcid.org/0000-0002-6119-764X, Kokh, K.A., Tereshchenko, O.E. and Kuznetsova, T. V.;
CORE (COnnecting REpositories)