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@INPROCEEDINGS{Schpers:188604,
      author       = {Schäpers, Thomas},
      title        = {{B}allistic and phase-coherent transport in {I}n {A}s-based
                      nanowires},
      reportid     = {FZJ-2015-01946},
      year         = {2015},
      abstract     = {Semiconductor nanowires, fabricated by a bottom-up
                      approach, are very promising as buildingblocks for future
                      nanoscaled electronic devices. In addition, they are also
                      very interesting objectsfor studying fundamental quantum
                      phenomena. On InAs nanowires controlled by a set of
                      top-gateelectrodes ballistic transport was investigated. By
                      varying the gate voltage distinct conductancesteps due to
                      quantized conductance were observed. By means of
                      bias-dependent measurementsat various magnetic fields the
                      g-factor was extracted. In a set-up with two constrictions
                      in seriesit could be shown that the total conductance is
                      solely determined by the element with the lowerresistance.
                      We furthermore investigated GaAs/InAs core/shell nanowires,
                      where the highlyconductive InAs shell is wrapped around an
                      insulating GaAs core nanowire. These nanowireswere grown by
                      molecular beam epitaxy. At low temperatures pronounced flux
                      periodic (h/e)magnetoconductance oscillations are observed,
                      when the magnetic field is oriented along thenanowires axis.
                      These very regular oscillations are explained by the
                      formation of closed-loopquantum states in the tube-like InAs
                      shell comprising a flux periodic energy spectrum.
                      Themagnetoconductance oscillations are even observed at
                      temperatures as high as 50K.},
      month         = {Jan},
      date          = {2015-01-19},
      organization  = {Colloquium at IBM Research Laboratory,
                       Rüschlikon, Rüschlikon (Switzerland),
                       19 Jan 2015},
      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/188604},
}