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In multilayer moiré heterostructures, the interference of multiple twist angles ubiquitously leads to tunable ultralong-wavelength patterns known as supermoiré lattices. However, their impact on the system’s many-body electronic phase diagram remains largely unexplored. We present local compressibility measurements revealing numerous incompressible states resulting from supermoiré lattice–scale isospin symmetry breaking driven by strong interactions. By using the supermoiré lattice occupancy as a probe of isospin symmetry, we observed an unexpected doubling of the miniband filling near ν, possibly indicating a hidden phase transition or normal-state pairing proximal to the superconducting phase. Our work establishes supermoiré lattices as a tunable parameter for designing quantum phases and as an effective tool for unraveling correlated phenomena in moiré materials.

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  This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 3 Jul 2025; DOI: 10.1126/science.adl2544.

Keyword: Supermoiré lattice, Isospin symmetry breaking, Correlated electron states

Date published: 2025-08-14

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

• Science (ISSN: 10959203) vol. 389 issue. 6761 p. 736-740

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Manuscript type: Author's version (Accepted manuscript)

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First published URL: https://doi.org/10.1126/science.adl2544

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Updated at: 2026-07-29 13:03:56 +0900

Published on MDR: 2026-07-29 14:28:30 +0900