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HL: Fachverband Halbleiterphysik

HL 14: Poster: Two-Dimenaional Materials and Topological Insulators

HL 14.12: Poster

Monday, March 20, 2017, 14:00–18:00, P2-OG3

Long Wavelength Rayleigh Waves at the Surface of the Topological Insulator BiSbTeSe₂ — •Henning Kuhn, Matteo Montagnese, Jingyi Zhu, Zhiwei Wang, Yoichi Ando, and Paul H.M. van Loosdrecht — II. Physikalisches Institut, Universität zu Köln

Ultrafast transient grating measurements are performed on the topological insulator BiSbTeSe₂ in order to generate and investigate the properties of Rayleigh type surface acoustic waves (SAW) in the long wavelength (µm) regime, and their possible interactions with the topological surface states. The SAWs are observed as oscillations in the diffracted signal, with lifetimes exceeding 3 ns. The SAW dispersion and lifetime are measured as a function of temperature (10K to 300K) and for different azimuthal orientations of the SAW wave vector with respect to the crystallographic directions. No conclusive evidence for a coupling to the topological surface state is found.