Electron dynamics in graphene with gate-defined quantum dots
Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald - D-17489 Greifswald, Germany
Received: 12 September 2013
Accepted: 22 November 2013
We use numerically exact Chebyshev expansion and kernel polynomial methods to study transport through circular graphene quantum dots in the framework of a tight-binding honeycomb lattice model. 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.
PACS: 72.80.Vp – Electronic transport in graphene / 73.23.-b – Electronic transport in mesoscopic systems / 73.63.-b – Electronic transport in nanoscale materials and structures
© EPLA, 2013