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@ARTICLE{Neumann:828677,
      author       = {Neumann, Christoph and Banszerus, Luca and Schmitz, Michael
                      and Reichardt, Sven and Sonntag, Jens and Taniguchi, Takashi
                      and Watanabe, Kenji and Beschoten, Bernd and Stampfer,
                      Christoph},
      title        = {{L}ine shape of the {R}aman 2{D} peak of graphene in van
                      der {W}aals heterostructures},
      journal      = {Physica status solidi / B},
      volume       = {253},
      number       = {12},
      issn         = {0370-1972},
      address      = {Weinheim},
      publisher    = {Wiley-VCH70889},
      reportid     = {FZJ-2017-02569},
      pages        = {2326-2330},
      year         = {2016},
      abstract     = {The Raman 2D line of graphene is widely used for device
                      characterization and during device fabrication as it
                      contains valuable information on, e.g., the direction and
                      magnitude of mechanical strain and doping. Here, we present
                      systematic asymmetries in the 2D line shape of exfoliated
                      graphene and graphene grown by chemical vapor deposition.
                      Both graphene crystals are fully encapsulated in van der
                      Waals heterostructures, where hexagonal boron nitride and
                      tungsten diselenide are used as substrate materials. In both
                      material stacks, we find very low doping values and
                      extremely homogeneous strain distributions in the graphene
                      crystal, which is a hall mark of the outstanding electronic
                      quality of these samples. By fitting double Lorentzian
                      functions to the spectra to account for the contributions of
                      inner and outer processes to the 2D peak, we find that the
                      splitting of the sub-peaks, math formulacm−1 (hBN-Gr-WSe2)
                      and math formulacm−1 (hBN-Gr-hBN), is significantly lower
                      than the values reported in previous studies on suspended
                      graphene.},
      cin          = {PGI-9},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-9-20110106},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000390339000005},
      doi          = {10.1002/pssb.201600283},
      url          = {https://juser.fz-juelich.de/record/828677},
}