2D layered transport properties from topological insulator Bi2Se3 single crystals and micro flakes

Abstract

Low-field magnetotransport measurements of topological insulators such as Bi2Se3 are important for revealing the nature of topological surface states by quantum corrections to the conductivity, such as weak-antilocalization. Recently, a rich variety of high-field magnetotransport properties in the regime of high electron densities (∼10(19) cm(-3)) were reported, which can be related to additional two-dimensional layered conductivity, hampering the identification of the topological surface states. Here, we report that quantum corrections to the electronic conduction are dominated by the surface states for a semiconducting case, which can be analyzed by the Hikami-Larkin-Nagaoka model for two coupled surfaces in the case of strong spin-orbit interaction. However, in the metallic-like case this analysis fails and additional two-dimensional contributions need to be accounted for. Shubnikov-de Haas oscillations and quantized Hall resistance prove as strong indications for the two-dimensional layered metallic behavior. Temperature-dependent magnetotransport properties of high-quality Bi2Se3 single crystalline exfoliated macro and micro flakes are combined with high resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy, confirming the structure and stoichiometry. Angle-resolved photoemission spectroscopy proves a single-Dirac-cone surface state and a well-defined bulk band gap in topological insulating state. Spatially resolved core-level photoelectron microscopy demonstrates the surface stability.

DOI: 10.1038/srep27483

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@inproceedings{Chiatti20162DLT, title={2D layered transport properties from topological insulator Bi2Se3 single crystals and micro flakes}, author={Olivio Chiatti and Christian Riha and Dominic Lawrenz and Marco Busch and Srujana Dusari and Jaime S{\'a}nchez-Barriga and Anna Mogilatenko and Lada V Yashina and Sergio Valencia and Akin A. {\"{U}nal and Oliver Rader and Saskia F. Fischer}, booktitle={Scientific reports}, year={2016} }