Elucidating the role of energy dissipation and electronic friction in nanoscale diffusion
We plan to characterise the effect of van-der-Waals (vdW) interactions between heterocyclic analogues of benzene and graphite on the surface diffusion process. Therefore we propose to measure the diffusion of pyrazine (C4H4N2) and s-triazine (C3H3N3) on exfoliated graphite. By substituting nitrogen atoms into the ring of aromatic hydrocarbons the electronic density around the carbon atoms of the molecule is reduced, giving rise to a stronger bonding with the substrate via tuning of the vdW interaction. Hence, by systematically changing the interaction strength with the substrate, these experiments will allows us to elucidate different aspects of energy dissipation in surface diffusion, in particular the contribution of electronic friction.
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TAMTOEGL Anton; CZAKKEL Orsolya; EHRENREICH PETERSEN Emma; FOUQUET Peter; OTTESEN Martin; RUCKHOFER Adrian; Marco Sacchi and ZANOTTI Jean-Marc. (2019). Elucidating the role of energy dissipation and electronic friction in nanoscale diffusion. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-496
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