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@ARTICLE{Clark:896714,
      author       = {Clark, Oliver J. and Freyse, Friedrich and Aguilera, Irene
                      and Frolov, Alexander S. and Ionov, Andrey M. and Bozhko,
                      Sergey I. and Yashina, Lada V. and Sánchez-Barriga, Jaime},
      title        = {{O}bservation of a giant mass enhancement in the ultrafast
                      electron dynamics of a topological semimetal},
      journal      = {Communications Physics},
      volume       = {4},
      number       = {1},
      issn         = {2399-3650},
      address      = {London},
      publisher    = {Springer Nature},
      reportid     = {FZJ-2021-03547},
      pages        = {165},
      year         = {2021},
      abstract     = {Topological phases of matter offer exciting possibilities
                      to realize lossless charge and spin information transport on
                      ultrafast time scales. However, this requires detailed
                      knowledge of their nonequilibrium properties. Here, we
                      employ time-, spin- and angle-resolved photoemission to
                      investigate the ultrafast response of the Sb(111)
                      spin-polarized surface state to femtosecond-laser
                      excitation. The surface state exhibits a giant mass
                      enhancement which is observed as a kink structure in its
                      energy-momentum dispersion above the Fermi level. The kink
                      structure, originating from the direct coupling of the
                      surface state to the bulk continuum, is characterized by an
                      abrupt change in the group velocity by $~70\%,$ in agreement
                      with our GW-based band structure calculations. Our
                      observation of this connectivity in the transiently occupied
                      band structure enables the unambiguous experimental
                      verification of the topological nature of the surface state.
                      The influence of bulk-surface coupling is further confirmed
                      by our measurements of the electron dynamics, which show
                      that bulk and surface states behave as a single thermalizing
                      electronic population with distinct contributions from low-k
                      electron-electron and high-k electron-phonon scatterings.
                      These findings are important for future applications of
                      topological semimetals and their excitations in ultrafast
                      spintronics.},
      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          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000675343600001},
      doi          = {10.1038/s42005-021-00657-6},
      url          = {https://juser.fz-juelich.de/record/896714},
}