Data for paper: Initiating and imaging the coherent surface dynamics of charge carriers in real space

Dataset

Description

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 about 10 fs.
Date made available27 Jul 2016
PublisherUniversity of Bath
Temporal coverage1 Jan 2012 - 1 Jan 2016
Date of data production20 Sep 2014 - 1 Sep 2015

Cite this

Sloan, P. (Creator), Rusimova, K. (Creator), Bannister, N. (Creator), Harrison, P. (Creator), Crampin, S. (Creator), Palmer, R. E. (Creator), Lock, D. (Creator) (27 Jul 2016). Data for paper: Initiating and imaging the coherent surface dynamics of charge carriers in real space. University of Bath. 10.15125/BATH-00230