Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Transport: Graphene (TT with CPP/DS/DY/HL/O)

HL 29.5: Vortrag

Dienstag, 17. März 2015, 10:30–10:45, A 053

Fabry-Pérot interference in monolayer and bilayer graphene devices — •Ming-Hao Liu and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany

Recent progress on high-quality graphene device fabrications has made submicron- or even micron-scale phase-coherent phenomena in graphene experimentally observable. Hence reliable quantum transport simulations for ballistic graphene devices are nowadays highly demanded. In this talk we give an overview on how such simulations can be accurately and efficiently performed. Concrete examples of Fabry-Pérot interference in single pn junctions in suspended monolayer graphene [1], multiple pn junctions in monolayer graphene on substrate [2], and pnp junctions in bilayer graphene encapsulated by hexagonal boron nitrite [3] will be briefly shown, as well as further studies of “electron optics” in graphene.

[1] P. Rickhaus, R. Maurand, M.-H. Liu, M. Weiss, K. Richter,

and C. Schönenberger, Nature Comm. 4, 2342 (2013);

M.-H. Liu, et. al., arXiv:1407.5620 (2014).

[2] M. Drienovsky, F.-X. Schrettenbrunner, A. Sandner, D. Weiss,

J. Eroms, M.-H. Liu, F. Tkatschenko, and K. Richter,

Phys. Rev. B 89, 115421 (2014).

[3] A. Varlet, M.-H. Liu, V. Krueckl, D. Bischoff, P. Simonet,

K. Watanabe, T. Taniguchi, K. Richter, K. Ensslin, and T. Ihn,

Phys. Rev. Lett. 113, 116601 (2014).