Two-Dimensional Moire Phonon Polaritons

H Shi and C Li and D Pan and X Dai, NANO LETTERS, 25, 15460-15467 (2025).

DOI: 10.1021/acs.nanolett.5c03046

Phonon polaritons (PhPs) are hybrid light-matter modes. We investigate them in two-dimensional (2D) materials with twisted moire structures, revealing that the moire potential creates a new class of "moire PhPs". These exhibit a fundamental spectral reconstruction into multiple branches and, crucially, electromagnetic wave functions that are nanopatterned by the superlattice. Through numerical simulations based on realistic lattice models, we confirm the existence of these intriguing modes. The inherent nanoscale structuring produces a robust, spatially varying near-field response, establishing moire superlattices as a platform for engineering light-matter interactions.

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