Sliding ferroelectricity in a bulk misfit layer compound (PbS)$_{1.18}$VS$_2$
Cinthia Antunes Corr\^ea, Ji\v{r}\'i Voln\'y, Kate\v{r}ina, Tetalov\'a, Kl\'ara Uhl\'i\v{r}ov\'a, V\'aclav Pet\v{r}\'i\v{c}ek and, Martin Vondr\'a\v{c}ek, Jan Honolka, Tim Verhagen
TL;DR
This study demonstrates that misfit layer compounds, specifically (PbS)$_{1.18}$VS$_2$, exhibit sliding ferroelectricity induced by twist angles, offering a new approach to engineer ferroelectric properties in layered materials.
Contribution
It introduces misfit layer compounds as a novel platform for moiré-induced ferroelectricity, expanding beyond traditional 2D heterostructures.
Findings
Presence of twins with small twist angles confirmed by X-ray diffraction
Surface electrical potential indicates ferroelectricity due to twist
Misfit layer stacking can reproducibly generate moiré landscapes
Abstract
Twisted heterostructures of two-dimensional crystals can create a moir\'{e} landscape, which can change the properties of it's parent crystals. However, the reproducibility of manual stacking is far from perfect. Here, the alternated stacking of post-transition metal monochalcogenides and transition metal dichalcogenides in misfit layer compound crystals is used as a moir\'{e} generator. Using X-ray diffraction, the presence of twins with a well-defined small twist angle between them is shown. Due to the twist, the surface electrical potential from the induced ferroelectricity is observed using scanning probe microscopy and electron microscopy.
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Taxonomy
TopicsQuantum Dots Synthesis And Properties · 2D Materials and Applications · Spectroscopy and Quantum Chemical Studies