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DY: Fachverband Dynamik und Statistische Physik

DY 32: Quantum Chaos

DY 32.5: Vortrag

Mittwoch, 22. März 2017, 11:00–11:15, HÜL 186

Ballistic Transport in graphene antidot lattices — •George Datseris, Ragnar Fleischmann, and Theo Geisel — Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Goettingen, Germany

Recent experiments have demonstrated ballistic transport effects in graphene antidot super-lattices. In the two-dimensional electron gas of semiconductor heterostructures, antidot systems have long been established as a prime example of ballistic transport, showing fingerprints of nonlinear resonances and chaos in magneto-transport measurements. We study quasi-classical electron dynamics in graphene using different models of the antidot lattice and calculate their magneto-transport properties, in overall very good agreement with the experiments. In particular, we study the effects of imperfections in lithographically fabricated antidots and show that even significant perturbations of the potential landscape have little effect on most resonances, leaving the structure of resistance curves surprisingly robust to this disorder.