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Q: Fachverband Quantenoptik und Photonik
Q 7: Poster I
Q 7.6: Poster
Montag, 6. März 2023, 16:30–19:00, Empore Lichthof
Light-field control of electrons in graphene heterojunctions — •Tobias Boolakee1, Christian Heide1, Antonio Garzón-Ramírez2, Heiko B. Weber1, Ignacio Franco2,3, and Peter Hommelhoff1 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Department of Chemistry, University of Rochester, Rochester, New York, USA — 3Department of Physics, University of Rochester, Rochester, New York, USA
Ultrashort and intense laser pulses enable the observation and control of electronic processes in a wide variety of systems ranging from atomic and molecular processes to the microscopic motion of electrons inside solids. The time scale of this motion is set by the oscillation period of light, i.e., a few femtoseconds, and thus limits a potential bandwidth of emerging electric currents up to the petahertz range. Here we discuss strong-field physics in graphene, an electric conductor, and therefore, an ideal platform to drive and probe currents induced by the shape of the laser electric field. 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, the two types of carriers can be disentangled in their photocurrent response, as they are susceptible to the carrier-envelope phase of incident few-cycle laser pulses. These insights now enable us to design and demonstrate a proof-of-concept of an ultrafast logic gate.