Electric field screening in atomically thin layers of MoS2: the role of   interlayer coupling
  The aim of this work is to study the electrostatic screening by single and few-layer MoS2 sheets by means of electrostatic force microscopy in combination with a non-linear Thomas-Fermi Theory to interpret the experimental results. We find that a continuum model of decoupled layers, which satisfactorily reproduces the electrostatic screening for graphene and graphite, cannot account for the experimental observations. A three-dimensional model with an interlayer hopping parameter can on the other hand successfully account for the observed electric field screening by MoS2 nanolayers, pointing out the important role of the interlayer coupling in the screening of MoS2. 
Andres Castellanos-Gomez, Emmanuele Cappelluti, Rafael Rold\'an,   Nicol\'as Agra\"it, Francisco Guinea and Gabino Rubio-Bol...
cond-mat.mes-hall cond-mat.mtrl-sci