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Dual nature of magnetic dopants and competing trends in topological insulators

Author

Listed:
  • 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
    Novosibirsk State University
    Saint-Petersburg State University)

  • Oleg E. Tereshchenko

    (Novosibirsk State University
    Saint-Petersburg State University
    A.V. Rzanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences)

  • Kai Fauth

    (Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
    Wilhelm Conrad Röntgen-Center for Complex Material Systems, Universität Würzburg)

  • Matthias Bode

    (Physikalisches Institut, Experimentelle Physik II, Universität Würzburg
    Wilhelm Conrad Röntgen-Center for Complex Material Systems, Universität Würzburg)

  • Alexander V. Balatsky

    (Institute for Materials Science, Los Alamos National Laboratory
    Nordita, Center for Quantum Materials, KTH Royal Institute of Technology, Stockholm University)

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.

Suggested Citation

  • Paolo Sessi & Rudro R. Biswas & Thomas Bathon & Oliver Storz & Stefan Wilfert & Alessandro Barla & Konstantin A. Kokh & Oleg E. Tereshchenko & Kai Fauth & Matthias Bode & Alexander V. Balatsky, 2016. "Dual nature of magnetic dopants and competing trends in topological insulators," Nature Communications, Nature, vol. 7(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12027
    DOI: 10.1038/ncomms12027
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    Cited by:

    1. Jiayu Li & Qiushi Yao & Lin Wu & Zongxiang Hu & Boya Gao & Xiangang Wan & Qihang Liu, 2022. "Designing light-element materials with large effective spin-orbit coupling," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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