Dmitry Solenov, Chad Junkermeier, T. L. Reinecke, Kirill A. Velizhanin
We propose mechanisms to control the interaction between adsorbates on the surface of graphene. We show that the interaction between a pair of adsorbates---the change in adsorption energy of one adsorbate in the presence of another---is dominated by a non-linear exchange interaction mediated by graphene's pi-electrons. Ab initio density functional, numerical tight-binding, and analytical calculations are used to develop the theory. We demonstrate that the interaction can be tuned in a wide range (up to complete reversal) of values as a function of distance by adjusting the adsorbate-graphene bonding or the chemical potential.
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http://arxiv.org/abs/1301.5920
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