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

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

2009-03-12

arxiv.org/abs/0903.2163v2

Phys. Rev. Lett. 103, 067402 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.103.067402

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 $\sigma(\omega)=N\sigma_{uni}$ in both low and high frequency limits. [$\sigma_{uni}=(\pi/2) e^2/h$]. We use this physics to relate intermediate frequency conductivity trends to qualitative characteristics of the multilayer stacking sequence.

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