Photocurrents in bulk tellurium

We report a comprehensive study of polarized infrared/terahertz photocurrents in bulk tellurium crystals. We observe different photocurrent contributions and show that, depending on the experimental conditions, they are caused by the trigonal photogalvanic effect, the transverse linear photon drag e...

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Published in:arXiv.org 2023-12
Main Authors: Moldavskaya, M D, Golub, L E, Danilov, S N, Bel'kov, V V, Weiss, D, Ganichev, S D
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Language:English
Subjects:
Magnetic fields
Photoelectric effect
Photoelectric emission
Radiation absorption
Tellurium
Valence band
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Golub, L E
Danilov, S N
Bel'kov, V V
Weiss, D
Ganichev, S D
description We report a comprehensive study of polarized infrared/terahertz photocurrents in bulk tellurium crystals. We observe different photocurrent contributions and show that, depending on the experimental conditions, they are caused by the trigonal photogalvanic effect, the transverse linear photon drag effect, and the magnetic field induced linear and circular photogalvanic effects. All observed photocurrents have not been reported before and are well explained by the developed phenomenological and microscopic theory. We show that the effects can be unambiguously distinguished by studying the polarization, magnetic field, and radiation frequency dependence of the photocurrent. At frequencies around 30 THz, the photocurrents are shown to be caused by the direct optical transitions between subbands in the valence band. At lower frequencies of 1 to 3 THz, used in our experiment, these transitions become impossible and the detected photocurrents are caused by the indirect optical transitions (Drude-like radiation absorption).
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subjects Magnetic fields
Photoelectric effect
Photoelectric emission
Radiation absorption
Tellurium
Valence band
title Photocurrents in bulk tellurium
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