Authors
Daegwang Choi, Soon-Jae Lee, Seung-Woon Cho, Chan Bin Bark, Seik Pak, Dong-Jin Shin, Moon Jip Park, Su-Hyun Gong
Published in
Science advances. Volume 12. Issue 35. Pages eaed8846. Aug 28, 2026. Epub Aug 28, 2026.
Abstract
From atomic crystals to macroscopic material structures, twisted bilayer systems have emerged as a promising route to control wave phenomena. In few-layer van der Waals materials, however, the intrinsically weak interlayer coupling typically demands precise control of small twist angles to reach magic-angle conditions. Here, we show that twisted one-dimensional photonic crystal bilayers can overcome this limitation by accessing a regime of strong interlayer coupling-comparable to intralayer coupling. This strong coupling enables ultrawide flat-band formation even at large twist angles. We experimentally realize this regime by stacking tungsten disulfide gratings using a two-step lithography method, resulting in ultrawide chiral flat-band cascades in magic-angle twisted bilayer gratings. Our work not only provides a platform for designing photonic applications with a tunable photonic band but also explores a previously unidentified regime of physics that is unattainable in conventional solid-state-based moiré systems.
PMID:
42664342
Bibliographic data and abstract were imported from PubMed on 29 Aug 2026.
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