Quantum Geometric Moment Encodes Stacking Order of Moire Matter.

ABSTRACT: Exploring the topological characteristics of electronic bands is essential in condensed matter physics. Moiré materials featuring flat bands provide a versatile platform for engineering band topology and correlation effects. In moiré materials that break either time-reversal symmetry or inversion symmetry or both, electronic bands exhibit Berry curvature hotspots. Different stacking orders in these materials result in varied Berry curvature distributions within the flat bands, even when the band dispersion remains similar. However, experimental studies probing the impact of stacking order on the quantum geometric quantities are lacking. 1.4° twisted double bilayer graphene (TDBG) facilitates two distinct stacking orders (AB-AB, AB-BA) and forms an inversion broken moiré superlattice with e

SUBMITTER: Layek S 

PROVIDER: S-EPMC12004888 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature