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The magneto-transport properties of (111)-oriented single-crystal thin films of SnTe were investigated. SnTe (111) thin films were epitaxially grown on a BaF2 substrate by molecular beam epitaxy. By optimizing the growth conditions and the thickness of the films, the bulk carrier density could be reduced, making it possible to detect the surface transport. Magneto-conductance (MC) measurements show a cusp-like feature around zero magnetic field, which is attributed to the weak-antilocalization effect of the transport in the topological surface state. Detailed analysis of this negative MC reveals a reduced number of transport channels contributing to the surface transport, suggesting strong coupling between Dirac valleys on the SnTe (111) surface, as a characteristic feature of the transport in the multivalley structure of topological crystalline insulators.

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Publication history

Received: 23 August 2015
Revised: 14 October 2015
Accepted: 26 October 2015
Published: 09 December 2015
Issue date: February 2016

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© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015

Acknowledgements

Acknowledgements

The authors would like to thank T. Koyano in the Cryogenics Division of Research Facility Center for Science and Technology, University of Tsukuba for PPMS measurements. This work is partially supported by Grant-in-Aids for Scientific Research (KAKENHI) from the Japan Society for the Promotion of Science, CASIO Science Promotion Foundation, and Sumitomo Electric Industries Group CSR Foundation.

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Reprints and Permission requests may be sought directly from editorial office.
Email: nanores@tup.tsinghua.edu.cn

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