| Autor: |
Chao, Xu, Yancong, Chen, Xiangbin, Cai, Arno, Meingast, Xuyun, Guo, Fakun, Wang, Ziyuan, Lin, Tsz Wing, Lo, Christian, Maunders, Sorin, Lazar, Ning, Wang, Dangyuan, Lei, Yang, Chai, Tianyou, Zhai, Xin, Luo, Ye, Zhu |
| Rok vydání: |
2019 |
| Zdroj: |
Physical review letters. 125(4) |
| ISSN: |
1079-7114 |
| Popis: |
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^{'}-In_{2}Se_{3}, using optical and electron microscopy consolidated by first-principles calculations. Different from conventional 3D antiferroelectricity, antiferroelectricity in β^{'}-In_{2}Se_{3} 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^{'}-In_{2}Se_{3}, 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^{'}-In_{2}Se_{3} superstructure that has been under debate for over four decades. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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