Photonic spin Hall effect in bilayer graphene Moiré superlattices
arXiv:1811.00188 · doi:10.1103/PhysRevB.98.195431
Abstract
The formation of a superstructure - with a related Moiré pattern - plays a crucial role in the extraordinary optical and electronic properties of twisted bilayer graphene, including the recently observed unconventional superconductivity. Here we put forward a novel, interdisciplinary approach to determine the Moiré angle in twisted bilayer graphene based on the photonic spin Hall effect. We show that the photonic spin Hall effect exhibits clear fingerprints of the underlying Moiré pattern, and the associated light beam shifts are well beyond current experimental sensitivities in the near-infrared and visible ranges. By discovering the dependence of the frequency position of the maximal photonic spin Hall effect shift on the Moiré angle, we argue that the latter could be unequivocally accessed via all-optical far-field measurements. We also disclose that, when combined with the Goos-Hänchen effect, the spin Hall effect of light enables the complete determination of the electronic conductivity of the bilayer. Altogether our findings demonstrate that sub-wavelength spin-orbit interactions of light provide a unprecedented toolset for investigating optoelectronic properties of multilayer two-dimensional van der Waals materials.
arXiv comment7 pages, 4 figures
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- A perspective of twisted photonic structures
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- Photonic spin Hall effect in Haldane model materials
- Controllable thermal radiation from twisted bilayer graphen
- Emerging chiral optics from chiral interfaces
- Infrared photoresistance as a sensitive probe of electronic transport in twisted bilayer graphene
- Photonic Spin Hall Effect using bilayer Graphene in Nano Optomechanical Cavities
- Microwave Controlled Photonic Spin Hall Effect in Atomic System and Microwave Electrometry