Development of Ultrafast Nonvolatile Memory Based on Sliding Ferroelectricity in Moiré Polar Homostructures

Twisted stacks of van der Waals (vdW) crystals can form moiré superlattices with polar domains whose dipoles are antiferroelectrically aligned and controllable by applied electric fields [1]. Sliding ferroelectricity arises from nm-scale interlayer sliding in vdW materials, coupling in-plane atomic displacement to out-of-plane polarization switching [2]. This mechanism has been demonstrated in bilayer hexagonal boron nitride and semiconducting transition metal dichalcogenides, where polarization...