Surface phonons in topological insulator Bi(2)Te(3) 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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Detalles Bibliográficos
Autores principales: Trzaskowska, Aleksandra, Mroz, Boguslaw
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7367295/
https://www.ncbi.nlm.nih.gov/pubmed/32678195
http://dx.doi.org/10.1038/s41598-020-68690-z
Descripción
Sumario: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.

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