Strain-induced deterministic moiré superlattices in 2D materials

• 成果类型: Article
• 署名作者: Wu, Yu-Mi; Lee, Sihun; Xi, Yufeng; Funni, Stephen D.; Siddique, Saif; Williams, Natalie L.; Sartorello, Giovanni; Askari, Hesam; Cha, Judy J.
• 署名单位: Cornell University; University of Rochester; Cornell University; Cornell University; Cornell University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.2602234123
• 发表日期: 2026-06-02
• 页码: e2602234123
• 关键词: moir & eacute; superlattice; heterostrain; structural reconstruction; atomic-resolution STEM; polar distortions; graphene; TRANSITION; STATES; EVOLUTION; crystals

摘要

Moir & eacute; superlattices in two-dimensional (2D) materials have been realized through lattice mismatch or rotational misalignment between atomic layers. Here, we extend moir & eacute; formation to heterostrain in transition metal dichalcogenides using a scalable process that deterministically induces strain to 2D materials. By applying patterned thin-film stressors and probing the resulting atomic structure with scanning transmission electron microscopy, we directly resolve the induced heterostrain, lattice deformations, and stacking variations that produce the moir & eacute; superlattice. We find that uniaxial and biaxial heterostrain give rise to distinct moir & eacute; patterns, including stripes and distorted hexagonal geometries. Such reconstruction creates in-plane polar distortions at the domain boundaries of the moir & eacute; superlattice in MoS2, producing polarization textures different from those induced by twisting. The deterministic construction of moir & eacute; patterns using a well-established scalable process opens opportunities to design new moir & eacute; geometries in 2D materials.