Optical Hall response of bilayer graphene: the manifestation of chiral hybridised states in broken mirror symmetry lattices

Abstract

Understanding the mechanisms governing the optical activity of layered-stacked materials is crucial to the design of devices aimed at manipulating light at the nanoscale. Here, we show that both twisted and slid bilayer graphene are chiral systems that can deflect the polarization of linear polarized light. However, only twisted bilayer graphene supports circular dichroism. Our calculation scheme, which is based on the time-dependent Schrödinger equation, is particularly efficient for calculating the optical-conductivity tensor. Specifically, it allows us to show the chirality of hybridized states as the handedness-dependent bending of the trajectory of kicked Gaussian wave packets in bilayer lattices. We show that nonzero Hall conductivity is the result of the noncanceling manifestation of hybridized states in chiral lattices. We also demonstrate the continuous dependence of the conductivity tensor on the twist angle and the sliding vector.

24 pages, 6 figures

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Cited by in corpus (4)

• Chirality-induced spin texture switching in twisted bilayer graphene
• Terahertz Circular Dichroism in Commensurate Twisted Bilayer Graphene
• Optical activity and transport in twisted bilayer graphene: the essence of spatial dispersion effects
• Layer Hall counterflow as a model probe of magic-angle twisted bilayer graphene