Photoemission Spectroscopy of Magnetic and Non-magnetic Impurities on the Surface of the Bi${}_2$Se${}_3$ Topological Insulator

Abstract

Dirac-like surface states on surfaces of topological insulators have a chiral spin structure that suppresses back-scattering and protects the coherence of these states in the presence of non-magnetic scatterers. In contrast, magnetic scatterers should open the back- scattering channel via the spin-flip processes and degrade the state's coherence. We present angle-resolved photoemission spectroscopy studies of the electronic structure and the scattering rates upon adsorption of various magnetic and non-magnetic impurities on the surface of Bi${}_2$Se${}_3$, a model topological insulator. We reveal a remarkable insensitivity of the topological surface state to both non-magnetic and magnetic impurities in the low impurity concentration regime. Scattering channels open up with the emergence of hexagonal warping in the high-doping regime, irrespective of the impurity's magnetic moment.

5 pages, 4 figures

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Cited by in corpus (102)

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• The mechanism of caesium intercalation of graphene
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• Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi${}_{1-x}$Mn${}_x{)}_2$Se${}_3$
• Controllable magnetic doping of the surface state of a topological insulator
• Optical properties of Bi2Te2Se at ambient and high pressure
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• New interpretation of the origin of 2DEG states at the surface of layered topological insulators
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• Systematics of electronic and magnetic properties in the transition metal doped Sb${}_2$Te${}_3$ quantum anomalous Hall platform
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• Tuning the Dirac point to the Fermi level in the ternary topological insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$
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• Comparison of Sn-doped and nonstoichiometric vertical-Bridgman-grown crystals of the topological insulator Bi2Te2Se
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• Single Dirac-cone on the Cs-covered topological insulator surface Sb2Te3(0001)
• Response of the topological surface state to surface disorder in TlBiSe${}_2$
• Inducing Lifshitz transition by extrinsic doping of surface bands in topological crystalline insulator Pb${}_{1-x}$Sn${}_x$Se
• Spin diffusion and magnetoresistance in ferromagnet/topological-insulator junctions
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• Mass acquisition of Dirac fermions in Cr-doped topological insulator Sb2Te3 films
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• Persistent Coherence and Spin-Polarization of Topological Surface States on Topological Insulators
• Modeling Near-Surface Bound Electron States in Three-Dimensional Topological Insulator: Analytical and Numerical Approaches
• Distinct Effects of Cr Bulk Doping and Surface Deposition on the Chemical Environment and Electronic Structure of the Topological Insulator Bi2Se3
• Origin of Rashba-splitting in the quantized subbands at Bi2Se3 surface
• Engineered Near-Perfect Back-Scattering on Surface of Topological Insulator with Non-Magnetic Impurities
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• Reversible tuning of the surface state in a psuedo-binary Bi2(Te-Se)3 topological insulator
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• Screening and atomic-scale engineering of the potential at a topological insulator surface
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• Simultaneous Magnetic and Charge Doping of Topological Insulators with Carbon
• The Interplay of Topological Surface and Bulk Electronic States in Bi2Se3
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