Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Graphen: Adsorption, intercalation and doping II (joint session O/TT)

O 20.3: Vortrag

Montag, 12. März 2018, 17:15–17:30, MA 043

Physical adsorption on graphene: from ultra-long ranged attraction to full screening of weakly interacting substrates — •Alberto Ambrosetti and Pier Luigi Silvestrelli — via Marzolo 8, 35131 Padova, Italy

The Lifshitz-Zaremba-Kohn (LZK) theory is commonly regarded as the correct large-distance limit for the van der Waals (vdW) interactions between adsorbates and solid substrates. However, recent experiments are challenging the universality of the LZK theory over a broad spectrum of nanoscale materials. By overcoming the conventional local permittivity approximation, here we demonstrate that physical adsorption on graphene and other low-dimensional materials can exhibit highly non-trivial features. Substrate-adsorbate vdW interactions can be extremely long-ranged and externally tunable. Moreover, graphene can effectively screen weakly interacting supporting substrates, emerging as an effective tool for the experimental modulation of adsorption processes.