Two-Dimensional Antiferroelectricity in Nanostripe-Ordered In2Se3

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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  • Chao Xu
  • Yancong Chen
  • Xiangbin Cai
  • Arno Meingast
  • Xuyun Guo
  • Fakun Wang
  • Ziyuan Lin
  • Tsz Wing Lo
  • Christian Maunders
  • Sorin Lazar
  • Ning Wang
  • Yang Chai
  • Tianyou Zhai
  • Xin Luo
  • Ye Zhu


Original languageEnglish
Article number047601
Journal / PublicationPhysical Review Letters
Issue number4
Online published22 Jul 2020
Publication statusPublished - 24 Jul 2020


Two-dimensional (2D) layered materials have been an exciting frontier for exploring emerging physics at reduced dimensionality, with a variety of exotic properties demonstrated at 2D limit. Here, we report the first experimental discovery of in-plane antiferroelectricity in a 2D material β′-In2Se3, using optical and electron microscopy consolidated by first-principles calculations. Different from conventional 3D antiferroelectricity, antiferroelectricity in β′-In2Se3 is confined within the 2D layer and generates the unusual nanostripe ordering: the individual nanostripes exhibit local ferroelectric polarization, whereas the neighboring nanostripes are antipolar with zero net polarization. Such a unique superstructure is underpinned by the intriguing competition between 2D ferroelectric and antiferroelectric ordering in β′-In2Se3, which can be preserved down to single-layer thickness as predicted by calculation. Besides demonstrating 2D antiferroelectricity, our finding further resolves the true nature of the β′-In2Se3 superstructure that has been under debate for over four decades.

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Citation Format(s)

Two-Dimensional Antiferroelectricity in Nanostripe-Ordered In2Se3. / Xu, Chao; Chen, Yancong; Cai, Xiangbin et al.
In: Physical Review Letters, Vol. 125, No. 4, 047601, 24.07.2020.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review