Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.047601
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Funding
- Research Grants Council of Hong Kong [15305718, 16306818, 15303718, 15201617, C6021-14E]
- NSFC [21825103, 11804286, 11832019]
- Fundamental Research Funds for the Central Universities [19lgpy263]
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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 beta'-In2Se3, using optical and electron microscopy consolidated by first-principles calculations. Different from conventional 3D antiferroelectricity, antiferroelectricity in beta'-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 beta'-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 beta'-In2Se3 superstructure that has been under debate for over four decades.
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