Infrared Reflection Spectra of Pb1–xSnxSe (x = 0.2, 0.34) Topological Insulator Films on a ZnTe/GaAs Substrate and the Vibrational Modes of Multilayer Structures
- Authors: Novikova N.N.1, Yakovlev V.A.1, Kucherenko I.V.2, Vinogradov V.S.2, Aleschenko Y.A.2,3, Muratov A.V.2, Karczewski G.4, Chusnutdinow S.4
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Affiliations:
- Institute of Spectroscopy
- Lebedev Physical Institute
- National Research Nuclear University “MEPhI”
- Institute of Physics
- Issue: Vol 52, No 1 (2018)
- Pages: 34-40
- Section: Spectroscopy, Interaction with Radiation
- URL: https://journals.rcsi.science/1063-7826/article/view/202220
- DOI: https://doi.org/10.1134/S1063782618010177
- ID: 202220
Cite item
Abstract
The reflectance spectra of the topological insulator Pb1–xSnxSe (x = 0.2, 0.34) films grown by molecular-beam epitaxy on a ZnTe/GaAs substrate are measured in the range of 12–2500 cm–1 at room temperature. Using dispersion analysis, the frequencies of transverse optical phonons, plasma frequencies, highfrequency permittivities, and layer thicknesses are determined. In the quasi-steady-state approximation, the interface mode frequencies of the four-layer structure are calculated as a function of the overlap parameter χ1 (0 ≤ χ1 ≤ 1). The parameter describes the degree of overlap of two interface modes localized at planes bounding the layer to the right and left. The existence of interacting interface modes in the structure makes its spectrum different from the sum of component spectra. These differences manifest themselves in the experiment. The conditions of the interaction of interface modes with IR radiation are discussed.
About the authors
N. N. Novikova
Institute of Spectroscopy
Email: kucheren@sci.lebedev.ru
Russian Federation, ul. Fizicheskaya 5, Troitsk, Moscow oblast, 108840
V. A. Yakovlev
Institute of Spectroscopy
Email: kucheren@sci.lebedev.ru
Russian Federation, ul. Fizicheskaya 5, Troitsk, Moscow oblast, 108840
I. V. Kucherenko
Lebedev Physical Institute
Author for correspondence.
Email: kucheren@sci.lebedev.ru
Russian Federation, Leninskii pr. 53, Moscow, 119991
V. S. Vinogradov
Lebedev Physical Institute
Email: kucheren@sci.lebedev.ru
Russian Federation, Leninskii pr. 53, Moscow, 119991
Yu. A. Aleschenko
Lebedev Physical Institute; National Research Nuclear University “MEPhI”
Email: kucheren@sci.lebedev.ru
Russian Federation, Leninskii pr. 53, Moscow, 119991; Kashirskoe sh. 31, Moscow, 115409
A. V. Muratov
Lebedev Physical Institute
Email: kucheren@sci.lebedev.ru
Russian Federation, Leninskii pr. 53, Moscow, 119991
G. Karczewski
Institute of Physics
Email: kucheren@sci.lebedev.ru
Poland, Warsaw, PL-02668
S. Chusnutdinow
Institute of Physics
Email: kucheren@sci.lebedev.ru
Poland, Warsaw, PL-02668