Non-volatile electrical polarization switching via domain wall release in 3R-MoS2 bilayer
Dongyang Yang, Jing Liang, Jingda Wu, Yunhuan Xiao, Jerry I. Dadap, Kenji Watanabe, Takashi Taniguchi, Ziliang Ye
Abstract
Abstract Understanding the nature of sliding ferroelectricity is of fundamental importance for the discovery and application of two-dimensional ferroelectric materials. In this work, we investigate the phenomenon of switchable polarization in a bilayer MoS 2 with natural rhombohedral stacking, where the spontaneous polarization is coupled with excitonic effects through asymmetric interlayer coupling. Using optical spectroscopy and imaging techniques, we observe how a released domain wall switches the polarization of a large single domain. Our results highlight the importance of domain walls in the polarization switching of non-twisted rhombohedral transition metal dichalcogenides and open new opportunities for the non-volatile control of their optical response.