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Magnetic fluctuations in topological insulators with ordered magnetic adatoms: Cr on Bi2Se3 from first principles

AuthorsChotorlishvili, L.; Ernst, A.; Dugaev, V. K.; Komnik, A.; Vergniory, M.; Chulkov, Eugene V. ; Berakdar, J.
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review 89(7): 075103 (2014)
AbstractWe consider a system consisting of a topological insulator with an array of magnetic adatoms interacting with the surface states of electrons. We find that the indirect coupling of the magnetic impurities results in a ferromagnetic ordering of the magnetic moments and is also responsible for the unusual linear dispersion of the surface magnons. We also show that the interaction of magnons with surface electrons essentially renormalizes the electron energy spectrum. The renormalized spectrum is nonlinear and can be characterized by a negative effective mass of electrons and holes for any k≠0. The electron velocity near the Dirac point depends on the electron-magnon coupling. © 2014 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.89.075103
Identifiersdoi: 10.1103/PhysRevB.89.075103
issn: 2469-9950
e-issn: 2469-9969
Appears in Collections:(CFM) Artículos
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