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M. Taupin, Gaku Eguchi, P. Hoffegger, K. Kuroda, A. Kimura, S. Paschen:
"Metastable Surface States in Topological Insulators";
Vortrag: NTTI 2018, Luxembourg; 16.07.2018 - 19.07.2018.

Topological insulators are promising candidates for spintronic applications, as they have protected surface state robust against disorder, their symmetry forbid back-scattering and have spin-current. Recently, it has been reported that there is a systematic discrepancy between optical measurements (ARPES) and transport measurements (through quantum oscillations). The origin of this difference is not well understood and further investigations are needed.
We present transport measurements of the bulk insulating topological insulator TlBiSe2. Photo-induced phenomena and exotic current-voltage (IV) characteristics have been observed. By illuminating the sample, different states seems to emerge, like the existence of a hidden metallic state. Simultaneously, IV curves present a switching behaviour with hysteresis. These effects can be understood by introducing localized states on the surface. A unifying picture that would also fit the results reported in the literature is attempted.

Topological insulator, transport, low temperature