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@ARTICLE{Messaoudi:842699,
      author       = {Messaoudi, Omar and Ibañez-Azpiroz, Julen and Bouzar,
                      Hamid and Lounis, Samir},
      title        = {{N}ondegenerate valleys in the half-metallic ferromagnet
                      {F}e / {WS} 2},
      journal      = {Physical review / B},
      volume       = {97},
      number       = {3},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-00906},
      pages        = {035404},
      year         = {2018},
      abstract     = {We present a first-principles investigation of the
                      electronic properties of monolayer WS2 coated with an
                      overlayer of Fe. Our ab initio calculations reveal that the
                      system is a half-metallic ferromagnet with a gap of ∼1 eV
                      for the majority spin channel. Furthermore, the combined
                      effect of time-reversal symmetry breaking due to the
                      magnetic Fe overlayer and the large spin-orbit coupling
                      induced by W gives rise to nondegenerate K and K′ valleys.
                      This has a tremendous impact on the excited-state properties
                      induced by externally applied circularly polarized light.
                      Our analysis demonstrates that the latter induces a singular
                      hot-spot structure of the transition probability around the
                      K and K′ valleys for right and left circular polarization,
                      respectively. We trace back the emergence of this remarkable
                      effect to the strong momentum dependent spin-noncollinearity
                      of the valence band involved. As a main consequence, a
                      strong valley-selective magnetic circular dichroism is
                      obtained, making this system a prime candidate for
                      spintronics and photonics applications.},
      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) /
                      Calculation of quantum spin-fluctuations in nano-magnets
                      $(jias19_20161101)$},
      pid          = {G:(DE-HGF)POF3-142 / $G:(DE-Juel1)jias19_20161101$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000419098500006},
      doi          = {10.1103/PhysRevB.97.035404},
      url          = {https://juser.fz-juelich.de/record/842699},
}