Initiating and imaging the coherent surface dynamics of charge carriers in real space

Kristina Rusimova, Nicola Bannister, Patrick Harrison, Duncan Lock, Simon Crampin, Richard E Palmer, Peter Sloan

Research output: Contribution to journalArticle

14 Citations (Scopus)
148 Downloads (Pure)

Abstract

The tip of a scanning tunnelling microscope is an atomic-scale source of electrons and holes. As the injected charge spreads out it can induce adsorbed molecules to react. By comparing large-scale `before' and 'after' images of an adsorbate covered surface, the spatial extent of the nonlocal manipulation is revealed. Here we measure the nonlocal manipulation of toluene molecules on the Si(111)-7x7 surface at room temperature. Both the range and probability of nonlocal manipulation have a voltage dependence. A region within 5 to 15 nm of the injection site shows a marked reduction in manipulation. We propose that this region marks the extent of the initial coherent (i.e., ballistic) time-dependent evolution of the injected charge carrier. Using scanning tunnelling spectroscopy, we develop a model of this time-dependent expansion of the initially localized hole wavepacket within a particular surface state and deduce a quantum coherence (ballistic) lifetime of ∼ 10 fs.
Original languageEnglish
Article number12839
Pages (from-to)1-7
Number of pages7
JournalNature Communications
Volume7
Early online date28 Sep 2016
DOIs
Publication statusPublished - 28 Sep 2016

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