Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 2: Attosecond physics I
A 2.5: Talk
Monday, March 9, 2020, 12:15–12:30, f107
Strong-field coherent control of photoemission from tungsten needle tips with a two-color laser field — •Philip Dienstbier1, Timo Paschen1, Lennart Seiffert2, Thomas Fennel2, and Peter Hommelhoff1 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Institut für Physik, Universität Rostock, 18059 Rostock
Ionization by two-color laser fields with well-defined relative phase allows tuning and controlling electronic dynamics on the sub-femtosecond time scale. In the perturbative photoemission regime we have demonstrated electron emission induced by a fundamental that can be modulated with a contrast of up to 97.5% when superimposing a weak second harmonic field due to interference between two different quantum channels in photoemission from a nanometer sharp metallic needle tip [1,2].
We extend this coherent control scheme to the strong-field photoemission regime by using a two-color field synthesized with few-cycle pulses. In the strong-field regime, not only the ionization but also electron trajectories can be manipulated during the rescattering process by varying the relative phase of the second harmonic field [3]. In this talk we show experimental findings for field-driven dynamics and confirm the results by time-dependent Schrödinger equation and simple-man’s model simulations.
[1] M. Förster et al. , Phys. Rev. Lett. 117, 217601 (2016).
[2] T. Paschen et al., J. Mod. Opt. 64, 10-11, 1054-1060 (2017).
[3] L. Seiffert et al., J. Phys. B. 51, 134001 (2018).