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@ARTICLE{Sonntag:877732,
      author       = {Sonntag, Jens and Reichardt, S. and Wirtz, L. and
                      Beschoten, Bernd and Katsnelson, M. I. and Libisch, F. and
                      Stampfer, Christoph},
      title        = {{I}mpact of {M}any-{B}ody {E}ffects on {L}andau {L}evels in
                      {G}raphene},
      journal      = {Physical review letters},
      volume       = {120},
      number       = {18},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2020-02430},
      pages        = {187701},
      year         = {2018},
      abstract     = {We present magneto-Raman spectroscopy measurements on
                      suspended graphene to investigate the charge carrier
                      density-dependent electron-electron interaction in the
                      presence of Landau levels. Utilizing gate-tunable
                      magnetophonon resonances, we extract the charge carrier
                      density dependence of the Landau level transition energies
                      and the associated effective Fermi velocity vF. In contrast
                      to the logarithmic divergence of vF at zero magnetic field,
                      we find a piecewise linear scaling of vF as a function of
                      the charge carrier density, due to a magnetic-field-induced
                      suppression of the long-range Coulomb interaction. We
                      quantitatively confirm our experimental findings by
                      performing tight-binding calculations on the level of the
                      Hartree-Fock approximation, which also allow us to estimate
                      an excitonic binding energy of ≈6  meV contained in
                      the experimentally extracted Landau level transitions
                      energies.},
      cin          = {PGI-9 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29775369},
      UT           = {WOS:000432979900036},
      doi          = {10.1103/PhysRevLett.120.187701},
      url          = {https://juser.fz-juelich.de/record/877732},
}