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@ARTICLE{Rosenbach:891976,
      author       = {Rosenbach, Daniel and Schmitt, Tobias W. and Schüffelgen,
                      Peter and Stehno, Martin P. and Li, Zechuan and
                      Schleenvoigt, Michael and Jalil, Abdur R. and Mussler,
                      Gregor and Neumann, Elmar and Trellenkamp, Stefan and
                      Golubov, Alexander A. and Brinkman, Alexander and
                      Grützmacher, Detlev and Schäpers, Thomas},
      title        = {{R}eappearance of first {S}hapiro step in narrow
                      topological {J}osephson junctions},
      journal      = {Science advances},
      volume       = {7},
      number       = {26},
      issn         = {2375-2548},
      address      = {Washington, DC [u.a.]},
      publisher    = {Assoc.},
      reportid     = {FZJ-2021-01853},
      pages        = {eabf1854 -},
      year         = {2021},
      abstract     = {In Josephson junctions, a supercurrent across a
                      nonsuperconducting weak link is carried by electron-hole
                      bound states. Because of the helical spin texture of
                      nondegenerate topological surface states, gapless bound
                      states are established in junctions with topological weak
                      link. These have a characteristic 4π-periodic current phase
                      relation (CΦR) that leads to twice the conventional Shapiro
                      step separation voltage in radio frequency–dependent
                      measurements. In this context, we identify an attenuated
                      first Shapiro step in (Bi0.06Sb0.94)2Te3 (BST) Josephson
                      junctions with AlOx capping layer. We further investigate
                      junctions on narrow, selectively deposited BST nanoribbons,
                      where surface charges are confined to the perimeter of the
                      nanoribbon. Within these junctions, previously identified
                      signatures of gapless bound states are absent. Because of
                      confinement, transverse momentum sub-bands are quantized and
                      a topological gap opening is observed. Surface states within
                      these quantized sub-bands are spin degenerate, which evokes
                      bound states of conventional 2π-periodic CΦR within the
                      BST nanoribbon weak link.},
      cin          = {PGI-9},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-9-20110106},
      pnm          = {5222 - Exploratory Qubits (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5222},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34162537},
      UT           = {WOS:000664978800012},
      doi          = {10.1126/sciadv.abf1854},
      url          = {https://juser.fz-juelich.de/record/891976},
}