Lone-pair activated ferroelectricity and stable charged domain wall in Bi monolayer
Yunhao Lu,
Shulin zhong,
Xuanlin Zhang
et al.
Abstract:Ferroelectricity has been predicted in two-dimensional Group-Va elemental materials and confirmed in high-quality Bi monolayers by a recent experiment [Nature 617, 67 (2023)]. The origin of such elemental ferroelectricity is related to the spontaneous lattice distortion with atomic layer buckling. A surprising observation in experiment is the abundance of charged 180° head-to-head/tail-to-tail domain walls, distinct from conventional ferroelectrics, where the naturally occurring ferroelectric domain walls are … Show more
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