Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)

CPP 17.4: Vortrag

Montag, 16. März 2020, 11:30–11:45, WIL C107

Attosecond-fast current control at graphene-based interfaces — •Tobias Boolakee, Christian Heide, 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 contact with remarkable electronic and optical properties. We show that charge transfer across the graphene-SiC solid-state interface takes place within (300 ± 200) attoseconds (1 as = 10−18 s), which is the fastest charge transfer observed across a solid-state interface [1]. To reveal the attosecond dynamics, we apply femtosecond laser pulses and use saturable absorption in graphene as an intrinsic clock to determine how long an excited state stays excited before charge transfer and thermalization depopulate this state. Recent experimental results and a simple theoretical modelling based on rate equations and on a quantum mechanical model will be presented [2,3].

[1] Heide, C. et al. accepted in Nat. Photon.

[2] Higuchi, T. et al. Nature 550, 224–228 (2017).

[3] Heide, C. et al. New J. Phys. 21 (2019).

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