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Q: Fachverband Quantenoptik und Photonik
Q 34: Ultrashort laser pulses: Applications
Q 34.1: Talk
Tuesday, March 19, 2013, 14:00–14:15, F 142
Strong-field photoemission from metal nanotips in experiment and theory — •Michael Krüger1, Georg Wachter2, Michael Förster1, Christoph Lemell2, Joachim Burgdörfer2, and Peter Hommelhoff1,3 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching bei München — 2Institut für Theoretische Physik, Technische Universität Wien, A-1080 Wien, Austria — 3Universität Erlangen-Nürnberg, 91058 Erlangen
Few-cycle laser-induced strong-field photoemission from metal nanotips has recently attracted a lot of interest because of new findings, for example the strong sensitivity of the photoemission on the carrier-envelope phase [1]. Here we show spectrally resolved measurements of strong-field photoemission from tungsten tips for different experimental parameters such as laser intensity and applied static field strength [1–3]. We present theory models, among them the semiclassical three-step model and a more sophisticated time-dependent density functional theory (TDDFT) simulation. Despite the complexity of the system due to its solid-state nature, the interpretation of the involved physics is conceptionally even simpler than in the atomic analogue. Unlike in the atomic case, the tip breaks the symmetry, hence the number of electron trajectories is reduced and whole trajectory classes are forbidden.
[1] M. Krüger, M. Schenk, P. Hommelhoff, Nature 475, 78 (2011).
[2] G. Wachter et al., Phys. Rev. B 86, 035402 (2012).
[3] M. Krüger et al., New J. Phys. 14, 085019 (2012).