Condensed Matter Physics Seminar

2 p.m., Thursday, November 30, 2006
Room 1201, Physics Building

Theory of angular magnetic oscillations in bilayer graphene

Victor Yakovenko

(University of Maryland)

Abstract: Angular magnetoresistance oscillations (AMRO) are the oscillations of electric resistance as a function of the magnetic field orientation. They have been observed in various layered materials, such as organic conductors, intercalated graphite, GaAs superlattices, Sr₂RuO₄, and Tl₂Ba₂CuO₆, etc. AMRO represent the quantum-coherent Aharonov-Bohm interference in interlayer electron tunneling. The talk will present a general theory of AMRO for quasi-two-dimensional bilayers and multilayers formulated in geometrical terms. The theory of AMRO will be applied specifically to the graphene bilayers, where linear dispersion near the Dirac points and the Berry phase introduce significant modifications compared with the more conventional case of parabolic dispersion in semiconductors.

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