Optical activity and transport in twisted bilayer graphene: the essence of spatial dispersion effects
arXiv:2303.07330 · doi:10.1103/PhysRevB.107.195141
Abstract
This study investigates optical activity and quantum transport in twisted bilayer graphene (TBG) systems, demonstrating that the former results from spatial dispersion effects. The transfer matrix method is used to solve the propagation of electromagnetic waves through two graphene layers that act as the coupling surfaces of a dielectric slab. The resulting optical conductivity tensor is decomposed into a local and a drag part, with the drag transverse conductivity governing the TBG system's optical property. An effective continuum model is employed to analyze electron state formation and calculate relevant parts of the optical conductivity tensor. Correlation of electron motions leads to incomplete cancellation and a finite in the chiral TBG lattice. The study also calculates DC conductivity, showing TBG supports quantum conductivity proportional to at the intrinsic Fermi energy.
arXiv commentarXiv admin note: substantial text overlap with arXiv:2205.12675
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Cited by in corpus (6)
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- Layer Hall counterflow as a model probe of magic-angle twisted bilayer graphene
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