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http://elar.urfu.ru/handle/10995/111926
Название: | Structural, Optical and Electronic Properties of the Wide Bandgap Topological Insulator Bi1.1Sb0.9Te2S |
Авторы: | Khatchenko, Y. E. Yakushev, M. V. Seibel, C. Bentmann, H. Orlita, M. Golyashov, V. Ponosov, Y. S. Stepina, N. P. Mudriy, A. V. Kokh, K. A. Tereshchenko, O. E. Reinert, F. Martin, R. W. Kuznetsova, T. V. |
Дата публикации: | 2022 |
Издатель: | Elsevier Ltd Elsevier BV |
Библиографическое описание: | Structural, Optical and Electronic Properties of the Wide Bandgap Topological Insulator Bi1.1Sb0.9Te2S / Y. E. Khatchenko, M. V. Yakushev, C. Seibel et al. // Journal of Alloys and Compounds. — 2022. — Vol. 890. — 161824. |
Аннотация: | Successful applications of a topological insulator (TI) in spintronics require its bandgap to be wider then in a typical TI and the energy position of the Dirac point in the dispersion relations to be away from the valence and conduction bands. In this study we grew Bi1.1Sb0.9Te2S crystals and examined their elemental composition, structural, optical and electronic properties as well as the electronic band structure. The high structural quality of the grown crystals was established by X-ray diffraction and Raman spectroscopy. Angular resolved photoelectron spectroscopy demonstrated a near parabolic character of the valence and conduction bands and a direct bandgap of 0.36 eV. The dispersion relations also revealed a Dirac cone, confirming the topological insulator nature of this material, with the position of the Dirac point being 100 meV above the valence band maximum. Far infrared reflectivity spectra revealed a plasma edge and two phonon dips. Fitting these spectra with theoretical functions based on the Drude-Lorentz model allows determination of the high frequency dielectric constant (41.3), plasma frequency (936 cm−1) and the frequencies of two infrared phonons (177.7 cm−1 and 77.4 cm−1). © 2021 Elsevier B.V. |
Ключевые слова: | ARPES BI1.1SB0.9TE2S ELECTRONIC STRUCTURE FAR INFRARED OPTICAL REFLECTIVITY TOPOLOGICAL INSULATOR ANTIMONY COMPOUNDS BISMUTH COMPOUNDS CONDUCTION BANDS CRYSTAL STRUCTURE DISPERSIONS ELECTRIC INSULATORS ELECTRONIC PROPERTIES ENERGY GAP PHONONS QUANTUM THEORY REFLECTION SULFUR COMPOUNDS TELLURIUM COMPOUNDS TOPOLOGICAL INSULATORS VALENCE BANDS X RAY PHOTOELECTRON SPECTROSCOPY DIRAC POINT DISPERSION RELATIONS OPTICAL AND ELECTRONIC PROPERTIES WIDE-BAND-GAP |
URI: | http://elar.urfu.ru/handle/10995/111926 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор РИНЦ: | 47044312 |
Идентификатор SCOPUS: | 85114427301 |
Идентификатор WOS: | 000706835200004 |
Идентификатор PURE: | 23890457 |
ISSN: | 0925-8388 |
DOI: | 10.1016/j.jallcom.2021.161824 |
Сведения о поддержке: | The reported study was funded by RFBR, project number 19-29-12061 . The part of optical research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme "Spin" No AAAA-A18-118020290104-2 and No AAAA-A19-119081990020-8 and theme "Electron" No AAAAA18-118020190098-5 ). The study was also supported by the Russian Science Foundation (Project No. 17-12-01047 ) in the part of the crystal growth and state assignment of ISP SB RAS ( 0306–2019-0007 ) and IGM SB RAS. The Raman measurements were partially supported by the grant of the Russian Foundation for Basic Research (Project No. 19-52-18008 ). This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through project-ID 258499086 – SFB 1170 (A01), the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter–ct.qmat Project-ID 390858490 – EXC 2147 . |
Карточка проекта РНФ: | 17-12-01047 |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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Файл | Описание | Размер | Формат | |
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2-s2.0-85114427301.pdf | 2,24 MB | Adobe PDF | Просмотреть/Открыть |
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