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. We show that the solitons can have a surprisingly strong influence on collective modes of the system, e.g., plasmon- and phonon-polaritons. In particular, a twisted bilayer graphene can act as a photonic crystal for either two-dimensional or one-dimensional plasmon modes. On the other hand, in twisted boron nitride, the solitons can induce shift and splitting of the phonon-polaritons. Our theory provides explanation of recent nano-optical experiments done with twisted van der Waals heterostructures.
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Presenters
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Michael M Fogler
University of California San Diego, University of California, San Diego, UC San Diego, Physics, University of California, San Diego
Authors
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Michael M Fogler
University of California San Diego, University of California, San Diego, UC San Diego, Physics, University of California, San Diego