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@ARTICLE{Varykhalov:834199,
      author       = {Varykhalov, A. and Marchenko, D. and Sánchez-Barriga, J.
                      and Golias, E. and Rader, O. and Bihlmayer, G.},
      title        = {{T}ilted {D}irac cone on {W}(110) protected by mirror
                      symmetry},
      journal      = {Physical review / B},
      volume       = {95},
      number       = {24},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-04182},
      pages        = {245421},
      year         = {2017},
      abstract     = {Topologically nontrivial states reveal themselves in
                      strongly spin-orbit coupled systems by Dirac cones. However,
                      their appearance is not a sufficient criterion for a
                      topological phase. In topological insulators, where these
                      states protect surface metallicity, they are
                      straightforwardly assigned based on bulk-boundary
                      correspondence. On metals, where these states are suspected
                      to have tremendous impact as well, e.g., in catalysis, their
                      topological protection is difficult to assess due to the
                      lacking band gap and the frequent assignment to topological
                      properties appears unjustified. Here, we discover by
                      angle-resolved photoemission a state with the dispersion of
                      a Dirac cone at a low-symmetry point of W(110). Our ab
                      initio calculations predict this feature with a linear band
                      crossing and high spin polarization. However, instead of
                      being born by topology, the states arise from Rashba split
                      bands and do not fundamentally depend on the opening of a
                      spin-orbit gap. On the other hand, we find that the [001]
                      mirror plane protects the band crossing point and
                      renormalizes the dispersion towards a Dirac-cone shape. In
                      this sense, the discovered state is the metal counterpart of
                      the surface state of a topological crystalline insulator.
                      The Dirac cone is tilted due to its origin in an accidental
                      band crossing away from high symmetry points. Tilted Dirac
                      cones have recently been predicted for two- and
                      three-dimensional materials and were observed in
                      three-dimensional Weyl semimetals. Accordingly, the
                      protection and renormalization by mirror symmetry uncovered
                      here are a potentially much wider spread phenomenon which
                      does not require topological properties. Our results also
                      indicate why the massive gapless crossing predicted for
                      topological crystalline insulators has never been observed.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) /
                      Magnetic Anisotropy of Metallic Layered Systems and
                      Nanostructures $(jiff13_20131101)$},
      pid          = {G:(DE-HGF)POF3-142 / $G:(DE-Juel1)jiff13_20131101$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000404019900010},
      doi          = {10.1103/PhysRevB.95.245421},
      url          = {https://juser.fz-juelich.de/record/834199},
}