Square Moir\'e Superlattices in Twisted Two-Dimensional Halide Perovskites
Abstract
Moir\'e superlattices have emerged as a new platform for studying strongly correlated quantum phenomena, but these systems have been largely limited to van der Waals layer two-dimensional (2D) materials. Here we introduce moir\'e superlattices leveraging ultra-thin, ligand-free halide perovskites, facilitated by ionic interactions. Square moir\'e superlattices with varying periodic lengths are clearly visualized through high-resolution transmission electron microscopy. Twist-angle-dependent transient photoluminescence microscopy and electrical characterizations indicate the emergence of localized bright excitons and trapped charge carriers near a twist angle of ~10{\deg}. The localized excitons are accompanied by enhanced exciton emission, attributed to an increased oscillator strength by a theoretically forecasted flat band. This work illustrates the potential of extended ionic interaction in realizing moir\'e physics at room temperature, broadening the horizon for future investigations.
Keywords
Cite
@article{arxiv.2312.16679,
title = {Square Moir\'e Superlattices in Twisted Two-Dimensional Halide Perovskites},
author = {Shuchen Zhang and Linrui Jin and Yuan Lu and Linghai Zhang and Jiaqi Yang and Qiuchen Zhao and Dewei Sun and Joshua J. P. Thompson and Biao Yuan and Ke Ma and Akriti and Jee Yung Park and Yoon Ho Lee and Zitang Wei and Blake P. Finkenauer and Daria D. Blach and Sarath Kumar and Hailin Peng and Arun Mannodi-Kanakkithodi and Yi Yu and Ermin Malic and Gang Lu and Letian Dou and Libai Huang},
journal= {arXiv preprint arXiv:2312.16679},
year = {2023}
}