title: Signatures of Dirac fermion-mediated magnetic order.
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.
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Paolo
authors.initials: P
authors.lastname: Sessi
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Reis
authors.affiliation: Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Bathon
authors.affiliation: 1] V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia [2] Novosibirsk State University, Novosibirsk 630090, Russia.
authors.forename: Konstantin A
authors.initials: KA
authors.lastname: Kokh
authors.affiliation: 1] Novosibirsk State University, Novosibirsk 630090, Russia [2] A.V. Rzanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia.
authors.forename: Oleg E
authors.initials: OE
authors.lastname: Tereshchenko
authors.affiliation: 1] Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany [2] Wilhelm Conrad Röntgen-Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Bode