Faraday cage screening reveals intrinsic aspects of the van der Waals attraction

摘要: General properties of the recently observed screening van der Waals (vdW) attraction between a silica substrate and tip by insertion graphene are predicted using basic theory first-principles calculations. Results then focused on possible practical applications, as well an understanding nature vdW attraction, considering recent discoveries showing it competing against covalent ionic bonding. The traditional view arising from pairwise-additive London dispersion forces is considered Grimme’s “D3” method, comparing results to those Tkatchenko’s more general many-body (MBD) approach, all interpreted in terms Dobson’s framework. Encompassing experimental results, MBD force two bilayers shown scale up medium separations 1.25 de/d, where d bilayer separation de its equilibrium value, depicting antiscreening approaching inside de. Means unifying this correlation effect with included modern density functionals urgently required.