Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 101: Transport - Poster Session

TT 101.33: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Electron dynamics in graphene with gate-defined quantum dots — •Rafael Leslie Heinisch, Andreas Pieper, and Holger Fehske — Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald

We study transport through circular graphene quantum dots. We use numerically exact Chebyshev expansion and kernel polynomial methods in the framework of a tight-binding honeycomb lattice model [1]. Thereby, we confirm the scattering resonances and bound states for small dots found in the Dirac approximation. Our focus lies on the regime where individual modes of the electrostatically defined dot dominate the charge carrier dynamics. In particular, we discuss the scattering of an injected Dirac electron wave packet for a single quantum dot, electron confinement in the dot, the optical excitation of dot-bound modes, and the propagation of an electronic excitation along a linear array of dots.
A. Pieper, R. L. Heinisch, and H. Fehske arXiv:1311.6271