Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 41: Transport: Graphene (organized by TT)
HL 41.3: Vortrag
Dienstag, 1. April 2014, 10:15–10:30, WIL C107
Quantum transport simulations and Fabry-Perot interference patterns in multiple pn-junctions on graphene — •Fedor Tkatschenko1, Ming-Hao Liu1, Klaus Richter1, Martin Drienovsky2, Jonathan Eroms2, and Dieter Weiss2 — 1Institut für Theoretische Physik, Universität Regensburg — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Advancements in experimental techniques have led to an amazing progress towards excellent graphene samples and to graphene devices with fascinating properties, ranging from narrow pnp junctions below 100 nm to large mean free paths up to micron scales. In such devices the charge carriers undergo multiple reflections at pn or np interface leading to interesting Fabry-Perot-type interference patterns in the conductance map[1,2]. We address the peculiar features of Fabry-Perot resonances in graphene. To this end we calculate the potential profiles for typical experimental setups[3] with the quantum capacitance model and perform transport calculations using the recursive Green’s function technique. The numerical results are in good agreement with the experimental data. We further show that the leading contribution to the Fabry-Perot resonances in the conductance map originates from the first two pn junctions.
A.F. Young and Ph. Kim, Nat. Phys. 5 (2009)
P. Rickhaus, R. Maurand, M. H. Liu, M. Weiss, K. Richter and C. Schönenberger, Nat. Comm. 4 2342 (2013)
M. Drienovsky, F.-X. Schrettenbrunner, M. H. Liu, F. Tkatschenko, K.Richter, D. Weiss and J. Eroms, in preparation