Theory of plasmonic edge states in chiral bilayer systems
arXiv:2107.05764 · doi:10.1103/PhysRevB.104.115422
Abstract
We analytically describe the plasmonic edge modes for an interface that involves the twisted bilayer graphene (TBG) or other similar Moire van der Waals heterostructure. For this purpose, we employ a spatially homogeneous, isotropic and frequency-dependent tensor conductivity which in principle accounts for electronic and electrostatic interlayer couplings. We predict that the edge mode dispersion relation explicitly depends on the chiral response even in the nonretarded limit, in contrast to the collective bulk plasmonic excitations in the TBG. We obtain a universal function for the dispersion of the optical edge plasmon in the paramagnetic regime. This implies a correspondence of the chiral-TBG optical plasmon to a magnetoplasmon of a single sheet, and chirality is interpreted as an effective magnetic field. The chirality also opens up the possibility of nearly undamped acoustic modes in the paramagnetic regime. Our results may guide future near-field nanoscopy for van der Waals heterostructures. In our analysis, we retain the long-range electrostatic interaction, and apply the Wiener-Hopf method to a system of integral equations for the scalar potentials of the two layers.
20 pages, 4 figures
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Cited by in corpus (5)
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- Chirality probe of twisted bilayer graphene in the linear transport regime
- Neutral magic-angle bilayer graphene: Condon instability and chiral resonances
- Layer Hall counterflow as a model probe of magic-angle twisted bilayer graphene
- Optical N-plasmon: Topological hydrodynamic excitations in Graphene from repulsive Hall viscosity