Electron–plasmon interaction in Bi2Te3–Sb2Te3

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Abstract

During the study of the optical properties of solid solutions of Bi2Te3–Sb2Te3 p-type conductivity in the infrared range, it was found that in a single crystal Bi0.6Sb1.4Te3, deformation of the reflection coefficient spectra is observed in the frequency range of observation of the plasma resonance of free charge carriers. The deformation of the plasma edge increases with a decrease in temperature. Using the Kramers–Kronig dispersion relations from experimental reflection spectra, the spectral dependences of the real ε1 and imaginary parts ε2 of the permittivity function, as well as the energy loss function characterizing the rate of energy dissipation, are calculated. Splitting of the peak of the energy loss function was found, indicating the effect on the plasma resonance from another process occurring in the electronic system. It is established that such a process is the transition of electrons between nonequivalent extremes of the valence band. Convergence of collective and single-particle energies.

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About the authors

N. P. Stepanov

Zabaikalsky State University

Author for correspondence.
Email: np-stepanov@mail.ru
Russian Federation, 672038, Chita

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2. Fig. 1. Dependences of the energies of the plasmon Ep (1, 2) and the transition of electrons between nonequivalent extrema of the valence band ∆E (3, 4) in Bi2Te3–Sb2Te3 crystals at temperatures of 80 (1, 3) and 300 K (2, 4) [9].

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3. Fig. 2. Reflectivity spectra R of the Bi0.6Sb1.4Te3 crystal obtained at temperatures of 292 (1); 250 (2); 220 (3); 173 (4); 101 (5); 78 K (6).

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4. Fig. 3. Spectral dependences of the energy loss function Imε–1 of the Bi0.6Sb1.4Te3 crystal at temperatures of 78 (1); 101 (2); 173 (3); 292 K (4), calculated using the Kramers–Kronig relations from the spectra of the reflection coefficient R.

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