Photoemission Spectroscopy of Magnetic and Nonmagnetic Impurities on the Surface of the Bi[subscript 2]Se[subscript 3] Topological Insulator
Name
Valla-2012-Photoemission Spectroscopy of Magnetic.pdf
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1.96 MB
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Author(s)
Valla, T.
Pan, Z. -H.
Gardner, Dillon Richard
Lee, Young S.
Chu, Shaoyan
Alternative Title
Photoemission Spectroscopy of Magnetic and Nonmagnetic Impurities on the Surface of the Bi2Se3 Topological Insulator
Date Issued
March 2012
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Valla, T. et al. “Photoemission Spectroscopy of Magnetic and Nonmagnetic Impurities on the Surface of the Bi_{2}Se_{3} Topological Insulator.” Physical Review Letters 108.11 (2012): n. pag. Web. 4 May 2012. © 2012 American Physical Society
Version
Final published version
Abstract
Dirac-like surface states on surfaces of topological insulators have a chiral spin structure that suppresses backscattering and protects the coherence of these states in the presence of nonmagnetic scatterers. In contrast, magnetic scatterers should open the backscattering 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 the adsorption of various magnetic and nonmagnetic impurities on the surface of Bi[subscript 2]Se[subscript 3], a model topological insulator. We reveal a remarkable insensitivity of the topological surface state to both nonmagnetic 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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.117601
