Two-dimensional moir\'e phonon polaritons
Abstract
Phonon polaritons (PhPs) are hybrid light-matter modes. We investigate them in two-dimensional (2D) materials with twisted moir\'e structures, revealing that the moir\'e potential creates a new class of `moir\'e PhPs'. These exhibit a fundamental spectral reconstruction into multiple branches and, crucially, electromagnetic wavefunctions that are nano-patterned 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 moir\'e superlattices as a platform for engineering light-matter interactions.
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