Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 78: Transport: Graphene 1 (jointly with TT, MA, DY, DS, O)

HL 78.8: Talk

Thursday, March 29, 2012, 11:30–11:45, BH 334

Orbital Magnetism in graphene bulk and nanostructures — •Lisa Heße, Jürgen Wurm, and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, Germany

We study the magnetic response of finite and bulk graphene structures due to orbital motion of the charge carriers. Besides a semiclassical approach we use exact quantum mechanical calculus within the Dirac formalism to derive different analytic expressions for the magnetic susceptibility of extended systems at various field regimes. This allows us to study on the one hand edge effects which are accessible through our semiclassical treatment but also to gain profound knowledge of the importance of bulk effects in finite systems. In order to provide an independent confirmation of the theory we also perform numerical calculations on graphene nanostructures based on a tight-binding approximation.