Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 108: Electron-Driven Processes at Surfaces and Interfaces
O 108.3: Talk
Thursday, March 19, 2020, 15:30–15:45, TRE Ma
Two-color coherent control in photoemission from a metal needle tip — •Ang Li1, Yiming Pan2, Philip Dienstbier1, and Peter Hommelhoff1 — 1Department Physik, Friedrich- Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel
Nanotips are routinely used as electron sources in high-resolution electron microscopes [1] and as a basis for studying strong-field phenomena at the surface of solids [2]. Two-color laser-induced photoemission from these nanotips shows high visibility in photoemission with femtosecond coherent control [3,4]. Here, we report electron emission studied as a function of the laser wavelength. High visibilities of up to 95.8% in the photoemission has been observed. Further, the photoemission is studied as a function of the ratio of two laser intensities and for a large range of laser intensities. We present an exact quantum mechanical solution based on quantum-pathway interference. Supported by the measured results, this analysis delivers a general explanation to the two-color coherent control in photoemission on a metal nanotip.
[1] A. V. Crewe et al., Rev. Sci. Instrum. 39, 576 (1968).
[2] M. Krüger et al., J. Phys. B. 51, 172001 (2018).
[3] M. Förster et al., Phys. Rev. Lett. 117, 217601 (2016).
[4] T. Paschen et al., J. Mod. Opt. 64, 1054-1060 (2017).