Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 52: Ultrashort Laser Pulses II

Q 52.5: Vortrag

Donnerstag, 3. März 2016, 15:30–15:45, a310

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

Under an intense electric field (> 1 V/Å) of a focused pulsed laser, electrons in solids undergo both inter- and intra-band motions driven by the field [1,2]. In this presentation, we discuss theoretically how the interplay of these two dynamics of electrons contributes to the generation of photocurrent in graphene. Numerical simulation suggests that the excitation from the valence band to the conduction band is well described as a result of interference of electron wave packets generated by tunneling within subcycles of the oscillating field. This interference is sensitive to the temporal evolution of the electric field, which explains the experimentally observed carrier-envelope-phase dependence of the photocurrent under few-cycle laser pulse illumination.

[1] M. Hohenleutner et al., Nature 523, 573 (2015).

[2] T. Higuchi et al., Phys. Rev. Lett., 113, 213901 (2014).