Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 76: Poster Session: Transport 2
TT 76.14: Poster
Thursday, March 23, 2017, 15:00–19:00, P2-OG1
Phase-coherent transport in 3D topological insulators encapsulated in hexagonal boron nitride — •Shaham Jafarpisheh1,2, Kenji Watanabe3, Takashi Taniguchi3, Bernd Beschoten1,2, and Christoph Stampfer1,2,4 — 1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany — 2Helmholtz Virtual Institute for Topological Insulators (VITI), RWTH Aachen, 52072 Aachen, Germany — 3National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan — 4Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
The spin-polarized current on the surface of topological insulators is a unique property which makes them promising materials for spintronic applications. However exposure to air and contaminations during the device fabrication easily destroys the surface states. This can be avoided by protecting the two surfaces of the TI layer with hexagonal boron nitride (hBN) crystals. In this work we show transport measurements in fully encapsulated BSTS layers in hBN. We fabricate Hall bars of the sandwich structures with 1-dimensional side contacts to the TI-layer. By measuring weak antilocalization (WAL) at low fields we extract phase-coherence lengths which are close to the values imposed by electron-electron interactions but limited by spin-flip scattering at temperatures below 1K.