Multiferroicity and giant in-plane negative Poisson’s ratio in wurtzite monolayers

Abstract Monolayers of layered materials, such as graphite and molybdenum dichalcogenides, have been the focus materials science in last decades. Here, we reveal benign stability intriguing physical properties thinnest monolayer wurtzite ( wz ) semiconductors, which can be exfoliated from their bulk stacked to reform crystals. The candidate ZnX CdX (X = S, Se, Te) monolayers possess low cleavage energy direct bandgaps, harbor strongly coupled ferroelectricity ferroelasticity with transition barriers, giant in-plane negative Poisson’s ratio, well Rashba spin splitting, enabling co-tunability splitting auxetic magnitudes via multiferroic switching. These used building blocks devices structures, due inherent “self-healable” capacity, offer more flexibility for semiconductor fabrication provide a natural platform probe interplay multiple effects, bringing light into rich physics tetrahedral semiconductors.