Erlangen 2022 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 7: Laser-Beam Matter Interaction - Laser Applications II

K 7.7: Vortrag

Donnerstag, 17. März 2022, 15:30–15:45, K-H4

Light-field control of electrons in graphene: approaching ultrafast electronics — •Tobias Boolakee¹, Christian Heide¹, Antonio Garzón-Ramírez², Heiko B. Weber¹, Ignacio Franco², and Peter Hommelhoff¹ — ¹Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — ²Department of Chemistry, University of Rochester, Rochester, New York 14627, USA

Controlling the motion of electrons in solids on the timescale of an optical cycle is key to advance electronics to unprecedented switching bandwidths. Importantly, for this aim, we can distinguish and take advantage of two types of charge carriers: Real carriers, persisting after their excitation, and virtual carriers, existing during the light-matter interaction only. We show that in a gold-graphene-gold heterostructure, real and virtual charge carriers can be disentangled in the photo-generation of electric currents based on the carrier-envelope phase of incident few-cycle laser pulses. Our experimental observations are well supported by simulations on atomistically detailed charge transport in the heterostructure. These insights now enable us to design and demonstrate a proof-of-concept of an ultrafast logic gate with a potential bandwidth limited fundamentally by the frequency of light.