We study the adsorption of Li to graphene flakes described as aromaticmolecules. Surprisingly the out of plane deformation is much stronger for thedouble adsorption from both sides to the same ring than for a singleadsorption, although a symmetric solution seems possible. We thus have aninteresting case of spontaneous symmetry breaking. While we cannot rule out aJahn Teller deformation with certainty, this explanation seems unlikely andother options are discussed. We find a similar behavior for Boron-Nitrogensheets, and also for other light alkalines.
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