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@ARTICLE{Lpke:186447,
      author       = {Lüpke, F. and Manni, S. and Erwin, S. C. and Mazin, I. I.
                      and Gegenwart, P. and Wenderoth, M.},
      title        = {{H}ighly unconventional surface reconstruction of
                      ${\mathrm{{N}a}}_{2}{\mathrm{{I}r{O}}}_{3}$ with persistent
                      energy gap},
      journal      = {Physical review / B},
      volume       = {91},
      number       = {4},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-00521},
      pages        = {041405},
      year         = {2015},
      abstract     = {Na2IrO3 is an intriguing material for which spin-orbit
                      coupling plays a key role. Theoretical predictions have been
                      made that the surface of Na2IrO3 should exhibit a clear
                      signature of the quantum spin Hall effect. We studied the
                      surface of Na2IrO3 using scanning tunneling microscopy and
                      density-functional theory calculations. We observed atomic
                      level resolution of the surface and two types of
                      terminations with different surface periodicity and Na
                      content. By comparing bias-dependent experimental
                      topographic images to simulated images, we determined the
                      detailed atomistic structure of both observed surfaces. One
                      of these reveals a strong relaxation to the surface of Na
                      atoms from the subsurface region two atomic layers below.
                      Such dramatic structural changes well below the surface are
                      highly unusual and cast doubt on any prediction of surface
                      properties based on bulk electronic structure. Indeed, using
                      spatially resolved tunneling spectroscopy, we found no
                      indication of the predicted quantum spin Hall behavior.},
      cin          = {PGI-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {141 - Controlling Electron Charge-Based Phenomena
                      (POF3-141)},
      pid          = {G:(DE-HGF)POF3-141},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000348762200004},
      doi          = {10.1103/PhysRevB.91.041405},
      url          = {https://juser.fz-juelich.de/record/186447},
}