Physicists engineer ferroelectricity into well-known family of semiconductors

https://phys.org/news/2022-03-physicists-ferroelectricity-well-known-family-semiconductors.html

"when two single sheets of a TMD, each only a few atomic layers thick, are stacked parallel to each other, the material becomes ferroelectric. In a ferroelectric material, positive and negative charges spontaneously head to different sides, or poles. Upon the application of an external electric field, those charges switch sides, reversing the polarization. In the new materials, all of this happens at room temperature"