Large Berry phases in layered graphene

Details Large Berry phases in layered graphene Large Berry phases in layered graphene

2008-06-23

arxiv.org/abs/0806.3726v2

Phys. Rev. B 78, 205311 (2008)

Physics

Condensed Matter

Materials Science

8 pages, 4 figures; slight addition and reference correction

Scientific paper

10.1103/PhysRevB.78.205311

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.

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