Photoelectromagnetic Effect Induced by Terahertz Radiation in (Bi{sub 1 –x}Sb{sub x}){sub 2}Te{sub 3} Topological Insulators

Journal Article · Tue Jan 15 00:00:00 EST 2019 · Semiconductors

DOI:https://doi.org/10.1134/S1063782619010068· OSTI ID:22945091

Galeeva, A. V.; Gomanko, M. A. ^[1]; Tamm, M. E.; Yashina, L. V. ^[2]; Danilov, S. N. ^[3]; Ryabova, L. I. ^[2]

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1. Faculty of Physics, Moscow State University (Russian Federation)
2. Faculty of Chemistry, Moscow State University (Russian Federation)
3. Regensburg University (Germany)

The mobility of surface charge carriers is estimated based on an analysis of the photoelectromagnetic effect in three-dimensional (Bi{sub 1 –x}Sb{sub x}){sub 2}Te{sub 3} (0 ≤ x ≤ 0.55) topological insulators. A high degree of degeneracy of the carrier gas in combination with a low energy of the exciting terahertz quantum provide a nonequilibrium process associated exclusively with thermal heating of the carrier. Under these conditions, the photovoltage is determined by the mobility gradient of the surface and bulk carriers. The photovoltage and, consequently, the mobility gradient disappear completely with an increase in the bulk mobility up to 10{sup 5} cm{sup 2} V{sup –1} s{sup –1}. Photovoltage is clearly observed in the samples with comparatively low bulk mobility under the same experimental conditions.

• OSTI ID: 22945091
• Journal Information: Semiconductors, Vol. 53, Issue 1; Other Information: Copyright (c) 2019 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIMONY TELLURIDES
BISMUTH TELLURIDES
CHARGE CARRIERS
HEATING
MAGNETIC FIELDS
MOBILITY
PHOTOELECTRIC EFFECT
THREE-DIMENSIONAL LATTICES
TOPOLOGY