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Title: 2D layered transport properties from topological insulator Bi2Se3 single crystals and micro flakes
Authors: Chiatti, OlivioRiha, ChristianLawrenz, DominicBusch, MarcoDusari, SrujanaSánchez-Barriga, JaimeMogilatenko, AnnaYashina, Lada V.Valencia, SergioÜnal, Akin A.Rader, OliverFischer, Saskia F.
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Issue Date: 2016
Published in: Scientific Reports, Volume 6
Publisher: London : Nature Publishing Group
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 (∼1019 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.
Keywords: Electronic properties and materials; Topological insulators; behavior; crystal structure; model; oscillation; roentgen spectroscopy; stoichiometry; transmission electron microscopy
DDC: 530
License: CC BY 4.0 Unported
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