Moiré Phonons and Emergent Exciton-Phonon Coupling in a Moiré Heterobilayer

Can B. Uzundal; Woochang Kim; Zhiyuan Cui; Yuxuan Wei; Zheyu Lu; Qixin Feng; Francis L. Hong; Indrajit Maity; Takashi Taniguchi; Kenji Watanabe; Manish Jain; Mit H. Naik; Yoseob Yoon; Michael F. Crommie; Steven G. Louie; Feng Wang

arXiv · 2606.28185

Moiré Phonons and Emergent Exciton-Phonon Coupling in a Moiré Heterobilayer

Can B. Uzundal·Woochang Kim·Zhiyuan Cui·Yuxuan Wei·Zheyu Lu·Qixin Feng·Francis L. Hong·Indrajit Maity·Takashi Taniguchi·Kenji Watanabe·Manish Jain·Mit H. Naik·Yoseob Yoon·Michael F. Crommie·Steven G. Louie·Feng Wang

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Abstract

Moiré superlattices have emerged as a new platform for engineering electronic and optical properties in van der Waals heterostructures, enabling control over correlated and excitonic phenomena. Yet the impact of moiré superlattices on exciton-phonon coupling remains largely unexplored. Here we demonstrate emergent, layer-selective coupling between moiré phonons and moiré excitons in angle-aligned WS2/WSe2 heterobilayers. Using a broadband terahertz phonon transducer, we coherently launch moiré phonons that resonantly perturb the excitonic states. We show that the exciton-phonon coupling is intrinsically modified by the moiré superlattice in a layer-selective manner. A driven oscillator model captures the dynamics, revealing three moiré phonon resonances with distinct coupling to the moiré excitons. First principles calculations show that many moiré phonon modes can arise with distinct strongly hybridized in-plane and out-of-plane vibrations in the moiré unit cells. The calculations further identify the three experimentally observed moiré phonons and their emergent characteristic coupling to the moiré excitons.

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Can B. Uzundal, Woochang Kim, Zhiyuan Cui, Yuxuan Wei, Zheyu Lu, Qixin Feng, Francis L. Hong, Indrajit Maity, Takashi Taniguchi, Kenji Watanabe, Manish Jain, Mit H. Naik, Yoseob Yoon, Michael F. Crommie, Steven G. Louie, Feng Wang. 2026-06-26. Moiré Phonons and Emergent Exciton-Phonon Coupling in a Moiré Heterobilayer. https://arxiv.org/abs/2606.28185

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