Collective modes of twisted van der Waals materials
Invited
Abstract
Rotationally misalignment profoundly modifies electronic and lattice properties of van der Waals materials. If the twist angle between adjacent layers is small, a periodic network of dislocations (solitons) delineating large commensurate domains appears. The solitons can have a strong influence on collective modes of the system. A twisted bilayer graphene can act as a photonic crystal for two-dimensional plasmon modes. Propagation of plasmons along one-dimensional links and their scattering at the nodes of the network produces multi-band plasmonic spectra quasiperiodic in frequency. In a twisted boron nitride, the solitons can induce shift and splitting of phonon-polaritons. Our theory and modeling provides explanation for recent nano-optical experiments with twisted van der Waals heterostructures and indicates some possible future directions in this field.
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Presenters
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Michael Fogler
University of California, San Diego, Department of Physics, University of California San Diego, UC San Diego, Department of Physics, University of California, San Diego, UCSD, University of California San Diego
Authors
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Michael Fogler
University of California, San Diego, Department of Physics, University of California San Diego, UC San Diego, Department of Physics, University of California, San Diego, UCSD, University of California San Diego