Interface-tuning of ferroelectricity and quadruple-well state in CuInP${}_2$S${}_6$ via ferroelectric oxide

Kun Wang, Du Li, Jia Wang +4

Ferroelectric van der Waals CuInP${}_2$S${}_6$ possesses intriguing quadruple-well states and negative piezoelectricity. Its technological implementation has been impeded by the relati…