Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Ultrashort Laser Pulses

Q 39.7: Vortrag

Mittwoch, 13. März 2019, 15:45–16:00, S SR 211 Maschb.

Attosecond charge transfer over a graphene Schottky junction — •Christian Heide, Martin Hauck, Takuya Higuchi, Jürgen Ristein, Lothar Ley, Heiko B. Weber, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

Epitaxially grown monolayer graphene on bulk n-doped silicon carbide (SiC) forms a Schottky junction with remarkable electronic and optical properties. After illumination with ultrashort laser pulses photo-excited electrons in graphene can overcome the Schottky barrier towards SiC. In our study we demonstrate that this charge transfer occurs on a timescale of about 300 as, which is the fastest charge transfer observed between two materials relevant to electronics. To reveal this attosecond dynamics, we interpret the photocurrent as a function of laser fluence and pulse duration in terms of a detailed rate equation model that takes saturable absorption and various electron thermalization pathways into account.