Unconventional (anti)ferroelectricity in van der Waals group-IV monochalcogenides.

ABSTRACT: Fundamentally, ferroelectrics must belong to a noncentrosymmetric space group, limiting the exploration of more new ferroelectric materials. We circumvent this limitation by triggering structure distortion and inducing ferroelectricity in centrosymmetric van der Waals group-IV monochalcogenide GeSe semiconductor that features unexpected intrinsic out-of-plane antiferroelectricity. Double-type and single-type hysteresis loops from electric measurements, bonding distortion observed in in-situ atomic imaging, and perpendicular polarization uncovered by first-principles calculations, confirm the intrinsic out-of-plane antiferroelectricity and the antiferroelectric-ferroelectric transition induced by the vertical external electric-field. The hidden out-of-plane antiferroelectricity and field in

SUBMITTER: Sui F 

PROVIDER: S-EPMC11842844 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature