2D layered transport properties from topological insulator Bi${}_2$Se${}_3$ single crystals and micro flakes

Abstract

Low-field magnetotransport measurements of topological insulators such as Bi${}_2$Se${}_3$ 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 ($\sim 10^{19}$ 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 Bi${}_2$Se${}_3$ 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.

arXiv commentSci. Rep. (2016)

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• Observation of multichannel quantum coherent transport and electron-electron interaction in Bi2Te3 single crystal
• Electron spin dynamics of two-dimensional layered materials
• Transport in topological insulators with bulk-surface coupling: Interference corrections and conductance fluctuations
• The Emerging Weak Antilocalization Effect in Semimetal Ta${}_{0.7}$Nb${}_{0.3}$Sb${}_2$ Single Crystal
• Structural and magneto-transport studies of iron intercalated Bi2Se3 single crystals
• Detailed magneto-heat capacity analysis of SnAs topological superconductor
• Topological transitions to Weyl states in bulk Bi${}_2$Se${}_3$: Effect of hydrostatic pressure and doping
• Electronic Transport Studies of Ag-doped Bi2Se3 Topological Insulator
• Band Structure and Polarization Effects in Photothermoelectric Spectroscopy of a Bi2Se3 Device
• Accessing topological surface states and negative MR in sculpted nanowires of Bi2Te3 at ultra-low temperature
• Low-temperature magnetoresistance hysteresis in Vanadium-doped Bi${}_2$Te${}_{2.4}$Se${}_{0.6}$ bulk topological insulators
• Anomalous 140 K electronic transition in Bi${}_2$Se${}_3$: Possible charge order in a defect-engineered system
• Superconductivity at Pd/Bi${}_2$Se${}_3$ Interfaces Due to Self-Formed PdBiSe Interlayers