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@ARTICLE{Niu:828896,
      author       = {Niu, Chengwang and Buhl, Patrick and Bihlmayer, Gustav and
                      Wortmann, Daniel and Dai, Ying and Blügel, Stefan and
                      Mokrousov, Yuriy},
      title        = {{R}obust dual topological character with spin-valley
                      polarization in a monolayer of the {D}irac semimetal {N}a 3
                      {B}i},
      journal      = {Physical review / B},
      volume       = {95},
      number       = {7},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-02747},
      pages        = {075404},
      year         = {2017},
      abstract     = {Topological materials with both insulating and semimetal
                      phases can be protected by crystalline (e.g., mirror)
                      symmetry. The insulating phase, called a topological
                      crystalline insulator (TCI), has been investigated
                      intensively and observed in three-dimensional materials.
                      However, the predicted two-dimensional (2D) materials with
                      TCI phase are explored much less than 3D TCIs and 2D
                      topological insulators, while the 2D TCIs considered thus
                      far possess almost exclusively a square-lattice structure
                      with the mirror Chern number CM=−2. Here, we predict
                      theoretically that a hexagonal monolayer of Dirac semimetal
                      Na3Bi is a 2D TCI with a mirror Chern number CM=−1. The
                      large nontrivial gap of 0.31 eV is tunable and can be made
                      much larger via strain engineering, while the topological
                      phases are robust against strain, indicating a high
                      possibility for room-temperature observation of quantized
                      conductance. In addition, a nonzero spin Chern number
                      CS=−1 is obtained, indicating the coexistence of a 2D
                      topological insulator and a 2D TCI, i.e., the dual
                      topological character. Remarkably, a spin-valley
                      polarization is revealed in the Na3Bi monolayer due to the
                      breaking of crystal inversion symmetry. The dual topological
                      character is further explicitly confirmed via the unusual
                      behavior of the edge states under the corresponding symmetry
                      breaking.},
      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) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143) /
                      Magnetic Anisotropy of Metallic Layered Systems and
                      Nanostructures $(jiff13_20131101)$ / Topological transport
                      in real materials from ab initio $(jias12_20121101)$},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143 /
                      $G:(DE-Juel1)jiff13_20131101$ /
                      $G:(DE-Juel1)jias12_20121101$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000393500100005},
      doi          = {10.1103/PhysRevB.95.075404},
      url          = {https://juser.fz-juelich.de/record/828896},
}