Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 41: Transport: Graphene (organized by TT)

HL 41.4: Vortrag

Dienstag, 1. April 2014, 10:30–10:45, WIL C107

Ballistic interferences in suspended graphene — •Ming-Hao Liu¹, Peter Rickhaus², Romain Maurand², Markus Weiss², Klaus Richter¹, and Christian Schönenberger² — ¹Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany — ²Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Complex Fabry-Pérot interferences in ultraclean suspended graphene have been recently observed, with the ballistic origin confirmed by transport calculations well agreeing with experiment [1]. The observed conductance oscillations account for quantum interference of electron waves propagating ballistically over distances exceeding 1 µm. The complex interference patterns stem from Fabry-Pérot resonances within different cavities defined by electrically controlled pn junctions and the graphene-contact interfaces. In this talk, the theoretical part of this work [1], namely, the full modeling of the ballistic transport from contact to contact through the suspended graphene, will be illustrated at an appropriate depth.
P. Rickhaus, R. Maurand, M.-H. Liu, M. Weiss, K. Richter, and C. Schönenberger, Nat. Commun. 4, 2342 (2013)