2026-05-28 ブラウン大学
＜関連情報＞
- https://www.brown.edu/news/2026-05-28/superlattice
- https://www.science.org/doi/10.1126/science.ady6472
銀ナノ結晶の形状制御による超格子の遷移相の安定化 Stabilizing in-transition phases of superlattices through shape control of silver nanocrystals
Yasutaka Nagaoka, Timothy C. Moore, Arseniy Epishin, Zhenyang Liu, […] , and Ou Chen
Science Published:28 May 2026
DOI:https://doi.org/10.1126/science.ady6472
Editor’s summary
Phase transitions between ordered lattices often pass through short-lived intermediate structures that are difficult to capture and study. Through the self-assembly of silver nanocrystals with shapes ranging from spheres to truncated octahedra, Nagaoka et al. observed a structural evolution from face-centered cubic to body-centered cubic superlattices. Nanocrystals with intermediate shapes formed a stable, dissymmetric superlattice corresponding to an otherwise transient structure along the Nishiyama-Wasserman martensitic pathway. —Jack Huang
Abstract
In nanoscale assemblies, observations of structures in the transition pathways between high-symmetry lattices are rare because of the inherent instability of the intermediate phases. We report that silver nanocrystals with shapes similar to truncated octahedra (mecons) self-assemble into superlattices that are stable and resemble a previously unobserved phase that bridges face-centered and body-centered cubic structures along the Nishiyama-Wassermann martensitic pathway. These superlattices exhibited high structural purity and stability and created a robust and tunable dissymmetric phase landscape. Notably, light-matter coupling emerged in these silver nanocrystal superlattices through plasmon-photon hybridization at the quantum level.
