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Infrared Optical Conductivity of Bulk Bi2Te2Se

Moscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, Moscow Region, Russia
1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
Institute of Materials Science, Technische Universität Darmstadt, Jovanka-Bontschits-Str. 2, 64287 Darmstadt, Germany
P. N. Lebedev Physical Institute of the RAS, 119991 Moscow, Russia
Authors to whom correspondence should be addressed.
Crystals 2020, 10(7), 553;
Received: 8 June 2020 / Revised: 21 June 2020 / Accepted: 24 June 2020 / Published: 28 June 2020
(This article belongs to the Special Issue Advances in Topological Materials)
Mid- and near-infrared measurements reveal that the optical conductivity of the three-dimensional topological insulator, Bi2Te2Se, is dominated by bulk carriers and shows a linear-in-frequency increase at 0.5 to 0.8 eV. This linearity might be interpreted as a signature of three-dimensional (bulk) Dirac bands; however, band-structure calculations show that transitions between bands with complex dispersion contribute instead to the inter-band optical conductivity at these frequencies and, hence, the observed linearity is accidental. These results warn against the oversimplified interpretations of optical-conductivity measurements in different Dirac materials. View Full-Text
Keywords: topological insulators; optical conductivity; Dirac materials topological insulators; optical conductivity; Dirac materials
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MDPI and ACS Style

Zhukova, E.S.; Zhang, H.; Martovitskiy, V.P.; Selivanov, Y.G.; Gorshunov, B.P.; Dressel, M. Infrared Optical Conductivity of Bulk Bi2Te2Se. Crystals 2020, 10, 553.

AMA Style

Zhukova ES, Zhang H, Martovitskiy VP, Selivanov YG, Gorshunov BP, Dressel M. Infrared Optical Conductivity of Bulk Bi2Te2Se. Crystals. 2020; 10(7):553.

Chicago/Turabian Style

Zhukova, Elena S., Hongbin Zhang, Victor P. Martovitskiy, Yurii G. Selivanov, Boris P. Gorshunov, and Martin Dressel. 2020. "Infrared Optical Conductivity of Bulk Bi2Te2Se" Crystals 10, no. 7: 553.

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