Square Moiré Superlattices in Twisted Two-Dimensional Halide Perovskites
arxiv(2023)
摘要
Moiré 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 moiré
superlattices leveraging ultra-thin, ligand-free halide perovskites,
facilitated by ionic interactions. Square moiré 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.
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
moiré physics at room temperature, broadening the horizon for future
investigations.
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