Tilted Material in an Optical Cavity: Light-Matter Moiré Effect and Coherent Frequency Conversion

• URL: http://arxiv.org/abs/2508.11237v1
• Date: Fri, 15 Aug 2025 05:55:00 GMT
• Title: Tilted Material in an Optical Cavity: Light-Matter Moiré Effect and Coherent Frequency Conversion
• Authors: Arshath Manjalingal, Saeed Rahmanian Koshkaki, Logan Blackham, Arkajit Mandal,
• Abstract summary: We introduce and theoretically characterize a light-matter moir'e effect (LMME) that arises when a 2D material is tilted inside a planar optical cavity.<n>We show that this geometric tilt produces emergent periodicity in the light-matter coupling, yielding displaced replicas of the polariton dispersion and flat bands.<n>Our findings establish LMME as a new platform for engineering polariton band structures, the generation of flat bands and performing coherent frequency conversion relevant for developing polariton-based quantum devices.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Exciton-polaritons formed inside optical cavities offer a highly tunable platform for exploring novel quantum phenomena. Here, we introduce and theoretically characterize a light-matter moir\'e effect (LMME) that arises when a 2D material is tilted inside a planar optical cavity, in contrast to stacking multiple layers at a twist angle as is done in forming 2D moir\'e hetero-structures. We show that this geometric tilt produces emergent periodicity in the light-matter coupling, yielding displaced replicas of the polariton dispersion and flat bands near the Brillouin-zone center. Through time-dependent quantum dynamical simulations, we demonstrate that LMME enables coherent frequency conversion and remains robust against phonon-induced decoherence. Our findings establish LMME as a new platform for engineering polariton band structures, the generation of flat bands and performing coherent frequency conversion relevant for developing polariton-based quantum devices.

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