Large Berry phases in layered graphene
arXiv:0806.3726 · doi:10.1103/PhysRevB.78.205311
Abstract
Brillouin zones of graphene systems possess Dirac points, where band degeneracies occur. We study the variety of (and large magnitude) phases that the electronic states can acquire when a uniform time-dependent electric field carries the electrons around one or more Dirac points in a non-concentric fashion. An experimentally accessible determination of excess Berry phases is proposed involving the Zitterbewegung of electronic current near an orthogonality point in adiabatic motion.
8 pages, 4 figures; slight addition and reference correction
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