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@INPROCEEDINGS{Schpers:862633,
      author       = {Schäpers, Thomas},
      title        = {{P}hase-coherent transport in topological insulator
                      nanoribbon-based structures},
      reportid     = {FZJ-2019-02895},
      year         = {2019},
      abstract     = {Three-dimensional topological insulators have been subject
                      of increased interest in the past few years due to their
                      robust topologically protected surface states enclosing an
                      insulating bulk. Especially the spin-momentum locking of
                      these surface states makes this novel material class very
                      attractive for spintronic applications. However, often the
                      transport in the surface states is masked by a pronounced
                      bulk conductance contribution owing to a relatively large
                      background doping. By preparing topological insulator
                      nanoribbons a more favorable surface-to-volume ratio can be
                      achieved. In addition, these nanostructures allow to study
                      confinement related carrier transport. Our topological
                      insulator Bi2Te3 and Sb2Te3-based nanostructures were
                      fabricated by selective-area molecular beam epitaxy using a
                      SiO2/Si3N4-masked Si (111) substrate. We performed low
                      temperature magnetotransport measurements on the
                      nanoribbons, in order to investigate phase-coherent
                      phenomena. Furthermore, nanoribbons were covered in-situ
                      with superconducting electrodes to form topological
                      Josephson junctions. Here, a clear Josephson supercurrent
                      was observed. Measurements under microwave irradiation
                      revealed a series of Shapiro steps. The observed missing of
                      the first step indicates the presence of Majorana states.},
      month         = {Apr},
      date          = {2019-04-29},
      organization  = {Symposium on Quantum and
                       Nanoelectronic Devices, Lund (Sweden),
                       29 Apr 2019 - 29 Apr 2019},
      subtyp        = {Invited},
      cin          = {PGI-9},
      cid          = {I:(DE-Juel1)PGI-9-20110106},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/862633},
}