Projects per year
Control over individual atoms with the scanning tunnelling microscope (STM) holds the tantalising prospect of atomic-scale construction, but is limited by its "one atom at a time" serial nature. "Remote control" through non-local STM manipulation-as we have demonstrated in the case of chlorobenzene on Si(111)-7×7-offers a new avenue for future "bottom-up" nanofabrication, since hundreds of chemical reactions may be carried out in parallel. Thus a good understanding of the non-local manipulation process, as provided by recent experiments, is important. Comparison of scanning tunnelling spectroscopy (STS) measurements of the bare Si(111)-7×7 surface and chemisorbed chlorobenzene molecules with the voltage dependence of the non-local STM-induced desorption of chlorobenzene proves particularly instructive. For example, the chlorobenzene LUMO appears at +0.9 V with respect to the Fermi level, whereas non-local manipulation thresholds are found at +2.1 V and +2.7 V. This difference supports a picture in which the voltage thresholds for non-local electron-induced desorption depend principally on the energies of the electronic states of the surface. Furthermore, the demonstration that the non-local process is largely insensitive to surface steps up to five layers in height suggests that either the electron transport in this process is subsurface in character or surface charge transport is responsible but is in some way unaffected by the steps.
|Early online date||6 Aug 2014|
|Publication status||Published - Oct 2014|
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- 1 Finished
Breaking the Single Atom Limit in Atomic Manipulation
Engineering and Physical Sciences Research Council
1/11/12 → 30/10/14
Project: Research council
Data for paper: Initiating and imaging the coherent surface dynamics of charge carriers in real space
Sloan, P. (Creator), Rusimova, K. (Creator), Bannister, N. (Creator), Harrison, P. (Creator), Crampin, S. (Creator), Palmer, R. E. (Creator) & Lock, D. (Creator), University of Bath, 27 Jul 2016