Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene

H. Min and A. H. MacDonald

Physical Review Letters 103(6), 067402 (2009).

Abstract:

We show that the origin of the universal optical conductivity in a normal N-layer graphene multilayer is an emergent chiral symmetry which guarantees that σ(ω)=N σ_uni in both low and high-frequency limits. [σ_uni=π/2)e²/h]. We use this physics to relate intermediate frequency conductivity trends to qualitative characteristics of the multilayer stacking sequence.

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