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O: Fachverband Oberflächenphysik

O 62: [TT] Transport: Graphene 1 (jointly with MA, HL, DY, DS, O)

O 62.11: Vortrag

Donnerstag, 29. März 2012, 12:15–12:30, BH 334

Minimal tight-binding model for transport in graphene heterojunctions — •Ming-Hao Liu, Jan Bundesmann, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

A real-space Green’s function formalism based on a minimal tight-binding model is adopted to efficiently simulate ballistic transport in graphene heterojunctions. The basic idea is to make use of the Bloch theorem along the transverse dimension of the bulk graphene, which greatly reduces the computation load and hence allows experimental sizes in the longitudinal dimension. Numerically, we will show (i) consistency with the existing results based on the effective Dirac theory for chiral tunneling through pnp junctions in monolayer graphene (MLG) and bilayer graphene, (ii) good agreement with recent ballistic experiments on pnp junctions in MLG, and (iii) new predictions for spin-dependent tunneling through pn junctions in MLG in the presence of the Rashba spin-orbit coupling.