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@ARTICLE{Varykhalov:874717,
      author       = {Varykhalov, A. and Freyse, F. and Aguilera, Irene and
                      Battiato, M. and Krivenkov, M. and Marchenko, D. and
                      Bihlmayer, G. and Blügel, S. and Rader, O. and
                      Sánchez-Barriga, J.},
      title        = {{E}ffective mass enhancement and ultrafast electron
                      dynamics of {A}u(111) surface state coupled to a quantum
                      well},
      journal      = {Physical review research},
      volume       = {2},
      number       = {1},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2020-01629},
      pages        = {013343},
      year         = {2020},
      abstract     = {We show that, although the equilibrium band dispersion of
                      the Shockley-type surface state of two-dimensional Au(111)
                      quantum films grown on W(110) does not deviate from the
                      expected free-electron-like behavior, its nonequilibrium
                      energy-momentum dispersion probed by time- and
                      angle-resolved photoemission exhibits a remarkable kink
                      above the Fermi level due to a significant enhancement of
                      the effective mass. The kink is pronounced for certain
                      thicknesses of the Au quantum well and vanishes in the very
                      thin limit. We identify the kink as induced by the coupling
                      between the Au(111) surface state and emergent quantum-well
                      states which probe directly the buried gold-tungsten
                      interface. The signatures of the coupling are further
                      revealed by our time-resolved measurements which show that
                      surface state and quantum-well states thermalize together
                      behaving as dynamically locked electron populations. In
                      particular, relaxation of hot carriers following laser
                      excitation is similar for both surface state and
                      quantum-well states and much slower than expected for a bulk
                      metallic system. The influence of quantum confinement on the
                      interplay between elementary scattering processes of the
                      electrons at the surface and ultrafast carrier transport in
                      the direction perpendicular to the surface is shown to be
                      the reason for the slow electron dynamics.},
      cin          = {PGI-1 / JARA-FIT / IAS-1 / IEK-5 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)VDB881 /
                      I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)IEK-5-20101013 /
                      $I:(DE-82)080012_20140620$},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522) / 142 -
                      Controlling Spin-Based Phenomena (POF3-142) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-522 / G:(DE-HGF)POF3-142 /
                      G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000602699100007},
      doi          = {10.1103/PhysRevResearch.2.013343},
      url          = {https://juser.fz-juelich.de/record/874717},
}