Dual nature of magnetic dopants and competing trends in topological insulators

Paolo Sessi (), Rudro R. Biswas, Thomas Bathon, Oliver Storz, Stefan Wilfert, Alessandro Barla, Konstantin A. Kokh, Oleg E. Tereshchenko, Kai Fauth, Matthias Bode and Alexander V. Balatsky
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Paolo Sessi: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Rudro R. Biswas: Purdue University
Thomas Bathon: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Oliver Storz: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Stefan Wilfert: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Alessandro Barla: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche
Konstantin A. Kokh: V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
Oleg E. Tereshchenko: Novosibirsk State University
Kai Fauth: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Matthias Bode: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
Alexander V. Balatsky: Institute for Materials Science, Los Alamos National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Topological insulators interacting with magnetic impurities have been reported to host several unconventional effects. These phenomena are described within the framework of gapping Dirac quasiparticles due to broken time-reversal symmetry. However, the overwhelming majority of studies demonstrate the presence of a finite density of states near the Dirac point even once topological insulators become magnetic. Here, we map the response of topological states to magnetic impurities at the atomic scale. We demonstrate that magnetic order and gapless states can coexist. We show how this is the result of the delicate balance between two opposite trends, that is, gap opening and emergence of a Dirac node impurity band, both induced by the magnetic dopants. Our results evidence a more intricate and rich scenario with respect to the once generally assumed, showing how different electronic and magnetic states may be generated and controlled in this fascinating class of materials.

Date: 2016
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DOI: 10.1038/ncomms12027

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