Ferroelectricity in strained Hf$_2$CF$_2$ monolayer
Ziwen Wang,
Ning Ding,
Churen Gui
et al.
Abstract:Low dimensional ferroelectrics are highly desired for applications and full of exotic physics. Here a functionalized MXene Hf2CF2 monolayer is theoretically studied, which manifests a nonpolar to polar transition upon moderate biaxial compressive strain. Accompanying this structural transition, a metal-semiconductor transition occurs. The in-plane shift of unilateral fluorine layer leads to a polarization pointing out-of-plane. Such ferroelectricity is unconventional, similar to the recentlyproposed interlayer… Show more
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