Optics and Spectroscopy
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Changes in the optical functions of a Bi0.6Sb1.4Te3 crystal when the plasmon and electronic transition
Stepanov N.P.
1,2
1Transbaikal State University, Chita, Russia
2Baikal State University, Irkutsk, Russia
2Baikal State University, Irkutsk, Russia
Email: np-stepanov@mail.ru
During the study of the reflection spectra of the Bi0.6Sb1.4Te3 crystal, a deformation of the plasma edge was detected, which increases with a decrease in temperature. The analysis of the behavior of optical functions calculated from the reflection spectra using the Kramers-Kronig relations suggests that there is a convergence of the energies of the plasmon Ep and the electron transition between the nonequivalent extremes of the valence band Δ E, accompanied by an increase in the electron-plasmon interaction. The changes in the real and imaginary parts of the permittivity function, as well as the energy loss functions occurring during the convergence of Ep and Δ E are described. It is established that the convergence of Ep and Δ E leads to the splitting of the peak of the energy loss function into two maxima, the spectral position of which does not change with a decrease in temperature from 101 to 78 K. Keywords: reflection spectra, optical functions, plasma oscillations, electronic transitions, electron-plasmon interaction.
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