Abstract
In the study of bismuth and bismuth-antimony alloy crystals with tin acceptor dopant, specific features of the spectra of plasma reflection of polarized infrared radiation are detected together with a difference between the static and optical relaxation times. It is established that the specific features in the behavior of optical functions and the maximum difference between the static and optical relaxation times are observed in crystals with the gap energy at point L of the Brillouin zone E gL comparable to the plasma oscillation energy E p. The amount of tin acceptor dopant in bismuth is found at which the above-indicated energies become close in values and the condition E p = E gL is satisfied.
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