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Graphene has proven to host outstanding mesoscopic effects involving massless Dirac quasiparticles travelling ballistically resulting in the current flow exhibiting light-like behaviour. A new branch of 2D electronics inspired by the standard principles of optics is rapidly evolving, calling for a deeper understanding of transport in large-scale devices at a quantum level. Here we perform large-scale quantum transport calculations based on a tight-binding model of graphene and the non-equilibrium Green's function method and include the effects of pn junctions of different shape, magnetic field, and absorptive regions acting as drains for current. We stress the importance of choosing absorbing boundary conditions in the calculations to correctly capture how current flows in the limit of infinite devices. As a specific application we present a fully quantum-mechanical framework for the'2D Dirac fermion microscope'recently …
IOP Publishing
Publication date: 
13 Aug 2018

Gaetano Calogero, Nick R Papior, Peter Bøggild, Mads Brandbyge

Biblio References: 
Volume: 30 Issue: 36 Pages: 364001
Journal of Physics: Condensed Matter