Signatures of Dirac fermion-mediated magnetic order

Paolo Sessi (), Felix Reis, Thomas Bathon, Konstantin A. Kokh, Oleg E. Tereshchenko and Matthias Bode
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Paolo Sessi: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland
Felix Reis: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland
Thomas Bathon: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland
Konstantin A. Kokh: V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
Oleg E. Tereshchenko: Novosibirsk State University
Matthias Bode: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The spin–momentum locking of topological states offers an ideal platform to explore novel magnetoelectric effects. These intimately depend on the ability to manipulate the spin texture in a controlled way. Here we combine scanning tunnelling microscopy with single-atom deposition to map the evolution of topological states under the influence of different magnetic perturbations. We obtain signatures of Dirac fermion-mediated magnetic order for extremely dilute adatom concentrations. This striking observation is found to critically depend on the single adatoms’ magnetic anisotropy and the position of the Fermi level. Our findings open new perspectives in spin engineering topological states at the atomic scale and pave the way to explore novel spin-related topological phenomena with promising potential for applications.

Date: 2014
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DOI: 10.1038/ncomms6349

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