Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 52: Ultrashort Laser Pulses II

Q 52.6: Vortrag

Donnerstag, 3. März 2016, 15:45–16:00, a310

Experimental observation of light-field controlled current in graphene — •Christian Heide, Takuya Higuchi, Konrad Ullmann, Heiko B. Weber, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) 91058 Erlangen

Here, we show experimental data of photocurrent generation in an epitaxially grown monolayer graphene ribbon under the illumination of few-cycle laser pulses. Thereby, we control the carrier-envelope-phase (CEP) of the pulses to change the carrier waveform, maintaining the temporal intensity envelope and the spectrum. We observed a dependence of the induced photocurrent on the CEP and the polarization of the laser. Both strongly suggest that the electrons are directly steered by the electric field within subcycles of the laser pulse. To explain the experimental findings we numerically simulate the population transfer from the valence band to the conduction band, which persists after the pulse is gone.