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@INPROCEEDINGS{Kleinjohann:874418,
      author       = {Kleinjohann, Iris and Fischer, Andreas and Jäschke,
                      Natalie and Anders, Frithjof B.},
      title        = {{O}ptical {P}umping of {E}lectron {S}pins in {Q}uantum
                      {D}ot {E}nsembles},
      volume       = {50},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2020-01428},
      series       = {Publication Series of the John von Neumann Institute for
                      Computing (NIC) NIC Series},
      pages        = {247 - 254},
      year         = {2020},
      comment      = {NIC Symposium 2020},
      booktitle     = {NIC Symposium 2020},
      abstract     = {We use the central spin model to analyse optical pumping of
                      singly charged quantum dots. An exact quantum mechanical
                      approach is employed to calculate the impact of several
                      million laser pulses. The periodical excitation imprints on
                      the system and the electron spin polarisation refocuses
                      directly before each pulse. Our calculations link the
                      non-monotonic behaviour of the revival amplitude as function
                      of the external magnetic field found in experiments to the
                      nuclear Larmor precession. Furthermore, we extend our model
                      to a cluster of coupled central spin models to investigate
                      long-range spin-spin interactions in quantum dot ensembles.
                      A semiclassical approach handles the large amount of spins.
                      By means of the cluster approach, we provide an
                      understanding of the electron spin dephasing at different
                      external magnetic fields and spectral widths of the optical
                      excitation. Our model reveals the counterbalancing effects
                      generating a constant dephasing time in dependence of the
                      spectral laser width in experiment.},
      month         = {Feb},
      date          = {2020-02-27},
      organization  = {NIC Symposium 2020, Jülich (Germany),
                       27 Feb 2020 - 28 Feb 2020},
      cin          = {NIC},
      cid          = {I:(DE-Juel1)NIC-20090406},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      url          = {https://juser.fz-juelich.de/record/874418},
}