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@ARTICLE{Tebbe:1025619,
      author       = {Tebbe, David and Schütte, Marc and Watanabe, Kenji and
                      Taniguchi, Takashi and Stampfer, Christoph and Beschoten,
                      Bernd and Waldecker, Lutz},
      title        = {{T}ailoring the dielectric screening in {WS}2–graphene
                      heterostructures},
      journal      = {npj 2D materials and applications},
      volume       = {7},
      number       = {1},
      issn         = {2397-7132},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2024-03008},
      pages        = {29},
      year         = {2023},
      abstract     = {The environment contributes to the screening of Coulomb
                      interactions in two-dimensional semiconductors. This can
                      potentially be exploited to tailor material properties as
                      well as for sensing applications. Here, we investigate the
                      tuning of the band gap and the exciton binding energy in the
                      two-dimensional semiconductor WS2 via the external
                      dielectric screening. Embedding WS2 in van der Waals
                      heterostructures with graphene and hBN spacers of
                      thicknesses between one and 16 atomic layers, we
                      experimentally determine both energies as a function of the
                      WS2-to-graphene interlayer distance and the charge carrier
                      density in graphene. We find that the modification to the
                      band gap as well as the exciton binding energy are well
                      described by a one-over-distance dependence, with a
                      significant effect remaining at several nanometers distance,
                      at which the two layers are electrically well isolated. This
                      observation is explained by a screening arising from an
                      image charge induced by the graphene layer. Furthermore, we
                      find that the effectiveness of graphene in screening Coulomb
                      interactions in nearby WS2 depends on its doping level and
                      can therefore be controlled via the electric field effect.
                      We determine that, at room temperature, it is modified by
                      approximately $20\%$ for charge carrier densities of
                      2 × 1012 cm−2.},
      cin          = {PGI-11 / PGI-9},
      ddc          = {670},
      cid          = {I:(DE-Juel1)PGI-11-20170113 / I:(DE-Juel1)PGI-9-20110106},
      pnm          = {5221 - Advanced Solid-State Qubits and Qubit Systems
                      (POF4-522) / 5222 - Exploratory Qubits (POF4-522) /
                      GrapheneCore3 - Graphene Flagship Core Project 3 (881603) /
                      DFG project 390534769 - EXC 2004: Materie und Licht für
                      Quanteninformation (ML4Q) (390534769)},
      pid          = {G:(DE-HGF)POF4-5221 / G:(DE-HGF)POF4-5222 /
                      G:(EU-Grant)881603 / G:(GEPRIS)390534769},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000966281100001},
      doi          = {10.1038/s41699-023-00394-0},
      url          = {https://juser.fz-juelich.de/record/1025619},
}