Journal
NANO LETTERS
Volume 6, Issue 4, Pages 809-814Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl0601379
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A reversible molecular switch is proposed, based on an observed change in a physisorbed pattern of chlorobenzene or toluene at Si(111)-(7 x 7), from triangles to circles. Electronic excitation, at an applied surface voltage of V-s = -2.0 V, caused molecular migration, by one atomic site, from under the tip (switch off). Thereafter, the adsorbate pattern reverted thermally from circles to triangles (switch on) across a measured activation barrier of E-a = 0.3 eV for chlorobenzene and 0.2 eV for toluene.
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