Mainz 2026 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Poster (joint session K/Q)
K 4.17: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Temperature-dependence of two-color laser-induced currents in graphene — •Celina Hüttner1, Weizhe Li1, Daniel Lesko1,2, and Peter Hommelhoff1,2 — 1Department Physik, Friedrich-Alexander-Universität (FAU) — 2Department Physik, Ludwig-Maximilians-Universität München (LMU)
Strong laser fields have previously been used to induce directional currents in solids via symmetry breaking, enabling electronic coherent control on the femtosecond timescale. In graphene, an inversion symmetric semi-metal with extraordinary electronic and optical properties, the photocurrent generation can be controlled by shaping the laser field, for instance through control of the carrier envelope phase or by combining harmonics of a laser pulse. As the latter requires a coherent interaction of both pulses and the electrons in graphene, it enables detailed exploration of decoherence- and dephasing-mechanisms. While the two-color photocurrents have been extensively studied before, the role of phonon-electron scattering remains unclear. In order to investigate this process, we cool graphene to temperatures below 25 K via a continuous flow cryostat setup and measure the two-color photocurrent, at both room and cryogenic temperature. We study the behavior of the photocurrent at different temperatures by varying field strength, polarization and the two-color-phase.
Keywords: Graphene; Photocurrents; Low-temperature