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arXiv · 2506.15083

Moiré-Polaritons in a Dark Bose-Einstein Condensate

Moroni Santiago-García·Shunashi G. Castillo-López·David A. Ruiz-Tijerina·Arturo Camacho-Guardian
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Abstract

Quantum mixtures of moiré excitons have arisen as a platform for realizing novel phases of light and matter. Here, we study moiré polaritons coupled to a Bose-Einstein condensate of dark-state excitons confined to a moiré superlattice. We develop a variational approach to analyze the optical response of the system and demonstrate that strong exciton-exciton interactions significantly modify the character of moiré polaritons, leading to sizable energy shifts of the avoided crossing between the principal polariton branches, and the emergence of an additional, stable repulsive-polariton bound state.

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Moroni Santiago-García, Shunashi G. Castillo-López, David A. Ruiz-Tijerina, Arturo Camacho-Guardian. 2025-06-18. Moiré-Polaritons in a Dark Bose-Einstein Condensate. https://arxiv.org/abs/2506.15083

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