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DY: Fachverband Dynamik und Statistische Physik
DY 9: Graphene II (organised by TT)
DY 9.16: Talk
Monday, March 14, 2011, 18:15–18:30, HSZ 304
Orbital magnetism in ballistic graphene quantum dots — •Lisa Heße1, Jürgen Wurm1, Inanç Adagideli2, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg, 93040 — 2Faculty of Engineering and Natural Sciences, Sabanci University, Orhanli - Tuzla, 34956, Turkey
We study the magnetic response of quasiparticles in graphene quantum dots. To this end we derive the density of states (DOS) of graphene nanostructures including the effect of a small magnetic field, starting from an exact expansion for the Green function of a graphene flake with arbitrary types of edges. We then consider systems much larger than the Fermi wavelength, for which we can evaluate this expansion in the semiclassical limit and obtain the DOS. For graphene, the structure of the boundary has significant effects on both the average DOS and the DOS oscillations. We then calculate the orbital magnetic susceptibility that is closely related to the DOS and discuss the pecularities that arise due to the different types of edges and the pseudospin degrees of freedom of charge carriers in graphene.