Yu. E. Kovalenko, M. V. Yakushev, V. I. Grebennikov, M. Orlita, S. G. Titova, K. A. Kokh, O. E. Tereshchenko, T. V. Kuznetsova, “Electronic properties of the topological insulator Sb<nobr>$_2$</nobr>Te<nobr>$_2$</nobr>Se”, Fizika i Tekhnika Poluprovodnikov, 2024, Volume 58, Issue 4,Pages <nobr>192–195</nobr>

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Fizika i Tekhnika Poluprovodnikov, 2024 Volume 58, Issue 4, Pages 192–195 (Mi phts6739)

XXVIII International Symposium ''Nanophysics and Nanoelectronics'', Nizhny Novgorod, 11-15 March 2024

Electronic properties of the topological insulator Sb$_2$Te$_2$Se

Yu. E. Kovalenko^a, M. V. Yakushev^abc, V. I. Grebennikov^a, M. Orlita^d, S. G. Titova^e, K. A. Kokh^fgh, O. E. Tereshchenko^hi, T. V. Kuznetsova^ac

^a Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 620108 Ekaterinburg, Russia
^b Institute of Solid-State Chemistry of the Ural Branch of the Russian Academy of Sciences, 620990 Ekaterinburg, Russia
^c Ural Federal University named after the First President of Russia B. N. Yeltsin, 620002 Ekaterinburg, Russia
^d National Laboratory for Intense Magnetic Fields (LNCMI), 38042 Grenoble Cedex 9, France
^e Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences, 620016 Ekaterinburg, Russia
^f Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
^g Kemerovo State University, 650000 Kemerovo, Russia
^h Novosibirsk State University, 630090 Novosibirsk, Russia
ⁱ Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia

Abstract: The structural and electronic properties of thin layers of single crystals of the topological insulator Sb$_2$Te$_2$Se were studied by X-ray diffraction and magneto-optical spectroscopy. A sharp edge of the absorption band as well as Fabry–Perot oscillations were revealed in the transmission spectra measured at 4.2 K which made it possible to estimate the band gap $E_g\approx$ 374 meV and the refractive index $n\approx$ 8.5. The application of magnetic fields up to 11 T led to a significant decrease in the amplitude of the oscillations attributed to the Faraday effect. The Verdet constant was estimated to be of $V\approx$ 10$^3$ degrees/cm $\cdot$ T.

Keywords: topological insulator, Sb$_2$Te$_2$Se, magneto-optics, transmission spectrum.

Received: 15.04.2024
Revised: 20.06.2024
Accepted: 20.06.2024

DOI: 10.61011/FTP.2024.04.58543.6332H

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