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@ARTICLE{Wei:884303,
      author       = {Wei, Xian‐Kui and Bihlmayer, Gustav and Zhou, Xiaodong
                      and Feng, Wanxiang and Kolen'ko, Yury V. and Xiong, Dehua
                      and Liu, Lifeng and Blügel, Stefan and Dunin‐Borkowski,
                      Rafal E.},
      title        = {{D}iscovery of {R}eal‐{S}pace {T}opological
                      {F}erroelectricity in {M}etallic {T}ransition {M}etal
                      {P}hosphides},
      journal      = {Advanced materials},
      volume       = {32},
      number       = {6},
      issn         = {0935-9648},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2020-03189},
      pages        = {2003479},
      year         = {2020},
      abstract     = {Ferroelectric metals—with coexisting ferroelectricity and
                      structural asymmetry—challenge traditional perceptions
                      because free electrons screen electrostatic forces between
                      ions, the driving force of breaking the spatial inversion
                      symmetry. Despite ferroelectric metals having been unveiled
                      one after another, topologically switchable polar objects
                      with metallicity have never been identified so far. Here,
                      the discovery of real‐space topological ferroelectricity
                      in metallic and non‐centrosymmetric Ni2P is reported.
                      Protected by the rotation–inversion symmetry operation, it
                      is found that the balanced polarity of alternately stacked
                      polyhedra couples intimately with elemental valence states,
                      which are verified using quantitative electron energy‐loss
                      spectroscopy. First‐principles calculations reveal that an
                      applied in‐plane compressive strain creates a tunable
                      bilinear double‐well potential and reverses the polyhedral
                      polarity on a unit‐cell scale. The dual roles of nickel
                      cations, including polar displacement inside polyhedral
                      cages and a 3D bonding network, facilitate the coexistence
                      of topological polarity with metallicity. In addition, the
                      switchable in‐plane polyhedral polarity gives rise to a
                      spin–orbit‐coupling‐induced spin texture with large
                      momentum‐dependent spin splitting. These findings point
                      out a new direction for exploring valence–polarity–spin
                      correlative interactions via topological ferroelectricity in
                      metallic systems with structural asymmetry.},
      cin          = {ER-C-2 / PGI-1 / IAS-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)ER-C-2-20170209 / I:(DE-Juel1)PGI-1-20110106 /
                      I:(DE-Juel1)IAS-1-20090406},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)
                      / CritCat - Towards Replacement of Critical Catalyst
                      Materials by Improved Nanoparticle Control and Rational
                      Design (686053)},
      pid          = {G:(DE-HGF)POF3-143 / G:(EU-Grant)686053},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:33029890},
      UT           = {WOS:000575804200001},
      doi          = {10.1002/adma.202003479},
      url          = {https://juser.fz-juelich.de/record/884303},
}