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@ARTICLE{Ersfeld:877348,
      author       = {Ersfeld, Manfred and Volmer, Frank and de Melo, Pedro
                      Miguel M. C. and de Winter, Robin and Heithoff, Maximilian
                      and Zanolli, Zeila and Stampfer, Christoph and Verstraete,
                      Matthieu J. and Beschoten, Bernd},
      title        = {{S}pin {S}tates {P}rotected from {I}ntrinsic
                      {E}lectron–{P}honon {C}oupling {R}eaching 100 ns
                      {L}ifetime at {R}oom {T}emperature in {M}o{S}e 2},
      journal      = {Nano letters},
      volume       = {19},
      number       = {6},
      issn         = {1530-6992},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2020-02155},
      pages        = {4083 - 4090},
      year         = {2019},
      abstract     = {We present time-resolved Kerr rotation measurements,
                      showing spin lifetimes of over 100 ns at room temperature in
                      monolayer MoSe2. These long lifetimes are accompanied by an
                      intriguing temperature-dependence of the Kerr amplitude,
                      which increases with temperature up to 50 K and then
                      abruptly switches sign. Using ab initio simulations, we
                      explain the latter behavior in terms of the intrinsic
                      electron–phonon coupling and the activation of transitions
                      to secondary valleys. The phonon-assisted scattering of the
                      photoexcited electron–hole pairs prepares a valley spin
                      polarization within the first few ps after laser excitation.
                      The sign of the total valley magnetization, and thus the
                      Kerr amplitude, switches as a function of temperature, as
                      conduction and valence band states exhibit different
                      phonon-mediated intervalley scattering rates. However, the
                      electron–phonon scattering on the ps time scale does not
                      provide an explanation for the long spin lifetimes. Hence,
                      we deduce that the initial spin polarization must be
                      transferred into spin states, which are protected from the
                      intrinsic electron–phonon coupling, and are most likely
                      resident charge carriers, which are not part of the
                      itinerant valence or conduction band states.},
      cin          = {PGI-9 / JARA-FIT},
      ddc          = {660},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31063385},
      UT           = {WOS:000471834900093},
      doi          = {10.1021/acs.nanolett.9b01485},
      url          = {https://juser.fz-juelich.de/record/877348},
}