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DY: Fachverband Dynamik und Statistische Physik
DY 10: Graphene (jointly with DY, MA, HL, DS, O) (joint session TT/DY/HL)
DY 10.12: Vortrag
Montag, 16. März 2020, 18:00–18:15, HSZ 201
Geometric-dissipative origin of the light-induced Hall current in graphene II — •Lukas Broers1, Marlon Nuske1,3, and Ludwig Mathey1,2,3 — 1Zentrum für optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany — 2Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany — 3CUI: Advanced Imaging of Matter, 22761 Hamburg, Germany
Inspired by the recent experiments by J. McIver, et al., Nature Physics (2019), we investigate the light-induced Hall current in graphene. We show that this Hall current derives from the Berry curvature and band velocity contributions of the occupied Floquet-states. To support this proposal we determine the energy and momentum resolved single particle correlation function. The resulting steady state momentum and energy distribution supports the interpretation as a Floquet induced mechanism. We find that for low driving intensity the main contribution to the Hall current emerges from the resonantly driven electron states of the Dirac cone. With increasing driving intensity, additional higher order resonances contribute, giving rise to the full Floquet-driven effect. We demonstrate this within a Master equation formalism, and obtain good quantitative agreement with the experimentally measured Hall current.