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@ARTICLE{DosSantos:857193,
      author       = {Dos Santos, Flaviano José and Bahamon, Dario A. and Muniz,
                      Roberto B. and McKenna, Keith and Castro, Eduardo V. and
                      Lischner, Johannes and Ferreira, Aires},
      title        = {{I}mpact of complex adatom-induced interactions on quantum
                      spin {H}all phases},
      journal      = {Physical review / B},
      volume       = {98},
      number       = {8},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-06430},
      pages        = {081407},
      year         = {2018},
      abstract     = {Adsorbate engineering offers a seemingly simple approach to
                      tailor spin-orbit interactions in atomically thin materials
                      and thus to unlock the much sought-after topological
                      insulating phases in two dimensions. However, the
                      observation of an Anderson topological transition induced by
                      heavy adatoms has proved extremely challenging despite
                      substantial experimental efforts. Here, we present a
                      multiscale approach combining advanced first-principles
                      methods and accurate single-electron descriptions of
                      adatom-host interactions using graphene as a prototypical
                      system. Our study reveals a surprisingly complex structure
                      in the interactions mediated by random adatoms, including
                      hitherto neglected hopping processes leading to strong
                      valley mixing. We argue that the unexpected intervalley
                      scattering strongly impacts the ground state at low adatom
                      coverage, which would provide a compelling explanation for
                      the absence of a topological gap in recent experimental
                      reports on graphene. Our conjecture is confirmed by
                      real-space Chern number calculations and large-scale quantum
                      transport simulations in disordered samples. This resolves
                      an important controversy and suggests that a detectable
                      topological gap can be achieved by increasing the spatial
                      range of the induced spin-orbit interactions on graphene,
                      e.g., using nanoparticles.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142)},
      pid          = {G:(DE-HGF)POF3-142},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000442077800001},
      doi          = {10.1103/PhysRevB.98.081407},
      url          = {https://juser.fz-juelich.de/record/857193},
}