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@ARTICLE{Leis:897249,
      author       = {Leis, Arthur and Schleenvoigt, Michael and Cherepanov,
                      Vasily and Lüpke, Felix and Schüffelgen, Peter and
                      Mussler, Gregor and Grützmacher, Detlev and Voigtländer,
                      Bert and Tautz, F. Stefan},
      title        = {{L}ifting the {S}pin‐{M}omentum {L}ocking in
                      {U}ltra‐{T}hin {T}opological {I}nsulator {F}ilms},
      journal      = {Advanced quantum technologies},
      volume       = {4},
      number       = {11},
      issn         = {2511-9044},
      address      = {Weinheim},
      publisher    = {Wiley-VCH Verlag},
      reportid     = {FZJ-2021-03711},
      pages        = {2100083 -},
      year         = {2021},
      abstract     = {3D topological insulators are known to carry 2D Dirac-like
                      topological surface states in which spin-momentum locking
                      prohibits backscattering. When thinned down to a few
                      nanometers, the hybridization between the topological
                      surface states at the top and bottom surfaces results in a
                      topological quantum phase transition, which can lead to the
                      emergence of a quantum spin Hall phase. Here, the
                      thickness-dependent transport properties across the quantum
                      phase transition are studied on the example of
                      (Bi0.16Sb0.84.)2Te3 films, with a four-tip scanning
                      tunneling microscope. The findings reveal an exponential
                      drop of the conductivity below the critical thickness. The
                      steepness of this drop indicates the presence of
                      spin-conserving backscattering between the top and bottom
                      surface states, effectively lifting the spin-momentum
                      locking and resulting in the opening of a gap at the Dirac
                      point. The experiments provide a crucial step toward the
                      detection of quantum spin Hall states in transport
                      measurements.},
      cin          = {PGI-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {5213 - Quantum Nanoscience (POF4-521) / DFG project
                      443416235 - 1D topologische Supraleitung und Majorana
                      Zustände in van der Waals Heterostrukturen charakterisiert
                      durch Rastersondenmikroskopie},
      pid          = {G:(DE-HGF)POF4-5213 / G:(GEPRIS)443416235},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000695620900001},
      doi          = {10.1002/qute.202100083},
      url          = {https://juser.fz-juelich.de/record/897249},
}