2025-07-14 ハーバード大学
Illustration of how three twisted, stacked sheets of graphene reveal supermoiré patterns.
＜関連情報＞
- https://seas.harvard.edu/news/2025/07/patterns-patterns-exploring-supermoire-engineering
- https://www.science.org/doi/10.1126/science.adl2544
スーパーモワレ格子における強い相互作用とアイソスピン対称性の破れ Strong interactions and isospin symmetry breaking in a supermoiré lattice
Yonglong Xie, Andrew T. Pierce, Jeong Min Park, Daniel E. Parker, […] , and Amir Yacoby
Science Published:3 Jul 2025
DOI:https://doi.org/10.1126/science.adl2544
Abstract
In multilayer moiré heterostructures, the interference of multiple twist angles ubiquitously leads to tunable ultra-long-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 observe an unexpected doubling of the miniband filling near ν=－2, 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 an effective tool for unraveling correlated phenomena in moiré materials.
