Surface phonons in topological insulator Bi2Te3 investigated by Brillouin light scattering

High resolution Brillouin spectroscopy was used for the first time to study the dispersion and anisotropy of surface phonons in the single crystal of topological insulator Bi 2 Te 3 . Two surface acoustic waves have been observed, which distinguishes this material from other metals or nontransparent...

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Bibliographic Details
Published in:Scientific reports 2020-07, Vol.10 (1), p.11812-11812, Article 11812
Main Authors: Trzaskowska, Aleksandra, Mroz, Boguslaw
Format: Article
Language:English
Subjects:
639/301/1023/303
639/301/119/2792/4128
639/301/119/544
Anisotropy
Experiments
Finite element analysis
Finite element method
Humanities and Social Sciences
Light scattering
Metals
multidisciplinary
Science
Science (multidisciplinary)
Simulation
Single crystals
Spectroscopy
Spectrum analysis
Surface acoustic waves
Velocity
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Summary:High resolution Brillouin spectroscopy was used for the first time to study the dispersion and anisotropy of surface phonons in the single crystal of topological insulator Bi 2 Te 3 . Two surface acoustic waves have been observed, which distinguishes this material from other metals or nontransparent materials. The modes were assigned as Rayleigh waves. The obtained results were then simulated by Finite Element Method. The layered structure of the unit cell proposed in simulation reproduced quite well experimental results of the modes dispersion and anisotropy.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-68690-z