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Filling of magnetic-impurity-induced gap in topological insulators by potential scattering
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 20, 201411Article in journal (Refereed) Published
Abstract [en]

We show that the energy gap induced by ferromagnetically aligned magnetic impurities on the surface of a topological insulator can be filled, due to scattering off the nonmagnetic potential of the impurities. In both a continuum surface model and a three-dimensional tight-binding lattice model, we find that the energy gap disappears already at weak potential scattering as impurity resonances add spectral weight at the Dirac point. This can help explain seemingly contradictory experimental results as to the existence of a gap.

Place, publisher, year, edition, pages
2015. Vol. 91, no 20, 201411
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Physical Sciences
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URN: urn:nbn:se:uu:diva-256837DOI: 10.1103/PhysRevB.91.201411ISI: 000355091600005OAI: oai:DiVA.org:uu-256837DiVA: diva2:827202
Available from: 2015-06-26 Created: 2015-06-26 Last updated: 2017-12-04Bibliographically approved

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Black-Schaffer, Annica M.Fransson, Jonas

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