SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Poster I
Q 7.10: Poster
Montag, 6. März 2023, 16:30–19:00, Empore Lichthof
Bi-chromatic current excitation in 2D-materials with complex laser fields — •Simon Wittigschlager1, Tobias Boolakee1, Christian Heide2, and Peter Hommelhoff1 — 1Department Physik, Friedrich-Alexander-Universität Erlangen (FAU), Erlangen-Nürnberg, Germany — 2Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California, USA
We present a highly versatile and stable scheme to drive ultrafast light field-induced currents in solids using bi-chromatic laser fields (1550 nm and 775 nm) with full control over the polarisation states of both colours to form complex sum fields. We use these laser fields to steer electrons inside 2D-materials on trajectories, tailored to probe specific characteristics of their underlying band structure. In particular, if the field waveform is asymmetric with respect to time inversion, a momentum imbalance of excited electrons may occur, resulting in a measurable photocurrent. Importantly, while such schemes are usually realized as a Michelson interferometer with both colours separated spatially, our collinear approach grants superior stability with 2.99 mrad long-term phase jitter without the use of active stabilization techniques. We expect this highly stable setup to form the basis for probing electronic phenomena in solids, such as spin polarisation, Berry curvature and topological states, with unprecedented resolution at ultrafast timescales.