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@ARTICLE{Sessi:825129,
      author       = {Sessi, P. and Rüßmann, P. and Bathon, T. and Barla, A.
                      and Kokh, K. A. and Tereshchenko, O. E. and Fauth, K. and
                      Mahatha, S. K. and Valbuena, M. A. and Godey, S. and Glott,
                      F. and Mugarza, A. and Gargiani, P. and Valvidares, M. and
                      Long, N. H. and Carbone, C. and Mavropoulos, P. and Blügel,
                      S. and Bode, M.},
      title        = {{S}uperparamagnetism-induced mesoscopic electron focusing
                      in topological insulators},
      journal      = {Physical review / B},
      volume       = {94},
      number       = {7},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2016-07606},
      pages        = {075137},
      year         = {2016},
      abstract     = {Recently it has been shown that surface magnetic doping of
                      topological insulators induces backscattering of Dirac
                      states which are usually protected by time-reversal symmetry
                      [Sessi et al., Nat. Commun. 5, 5349 (2014)]. Here we report
                      on quasiparticle interference measurements where, by
                      improved Fermi level tuning, strongly focused interference
                      patterns on surface Mn-doped Bi2Te3 could be directly
                      observed by means of scanning tunneling microscopy at 4 K.
                      Ab initio and model calculations reveal that their
                      mesoscopic coherence relies on two prerequisites: (i) a
                      hexagonal Fermi surface with large parallel segments
                      (nesting) and (ii) magnetic dopants which couple to a
                      high-spin state. Indeed, x-ray magnetic circular dichroism
                      shows superparamagnetism even at very dilute Mn
                      concentrations. Our findings provide evidence of strongly
                      anisotropic Dirac-fermion-mediated interactions and
                      demonstrate how spin information can be transmitted over
                      long distances, allowing the design of experiments and
                      devices based on coherent quantum effects in topological
                      insulators.},
      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) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143) /
                      Scattering of topologically protected states off defects in
                      topological insulators $(jara0078_20131101)$},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143 /
                      $G:(DE-Juel1)jara0078_20131101$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000381483700002},
      doi          = {10.1103/PhysRevB.94.075137},
      url          = {https://juser.fz-juelich.de/record/825129},
}