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American Association for the Advancement of Science, Science, 5854(318), p. 1287-1291, 2007

DOI: 10.1126/science.1146764

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Time-Resolved Investigation of Coherently Controlled Electric Currents at a Metal Surface

Journal article published in 2007 by J. Güdde ORCID, M. Rohleder, T. Meier, S. W. Koch, U. Höfer
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Studies of current dynamics in solids have been hindered by insufficiently brief trigger signals and electronic detection speeds. By combining a coherent control scheme with photoelectron spectroscopy, we generated and detected lateral electron currents at a metal surface on a femtosecond time scale with a contact-free experimental setup. We used coherent optical excitation at the light frequencies ω a and ω a /2 to induce the current, whose direction was controlled by the relative phase between the phase-locked laser excitation pulses. Time- and angle-resolved photoelectron spectroscopy afforded a direct image of the momentum distribution of the excited electrons as a function of time. For the first ( n = 1) image-potential state of Cu(100), we found a decay time of 10 femtoseconds, attributable to electron scattering with steps and surface defects.