TY - JOUR
T1 - Two-Dimensional Antiferroelectricity in Nanostripe-Ordered In2Se3
AU - Xu, Chao
AU - Chen, Yancong
AU - Cai, Xiangbin
AU - Meingast, Arno
AU - Guo, Xuyun
AU - Wang, Fakun
AU - Lin, Ziyuan
AU - Lo, Tsz Wing
AU - Maunders, Christian
AU - Lazar, Sorin
AU - Wang, Ning
AU - Lei, Dangyuan
AU - Chai, Yang
AU - Zhai, Tianyou
AU - Luo, Xin
AU - Zhu, Ye
N1 - Funding Information:
Y. Z., N. W., D. Y. L., and Y. C. are thankful for the financial support from the Research Grants Council of Hong Kong (No. 15305718, No. C6021-14E, No. 16306818, No. 15303718 and No. 15201617). X. L. is thankful for support from NSFC (No. 11804286 and No. 11832019), the Fundamental Research Funds for the Central Universities (No. 19lgpy263), and the resources of the National Supercomputer Center in Guangzhou. T. Y. Z. is thankful for support from NSFC (No. 21825103). Y. Z is thankful for the helpful discussion from Dr. Zhen Chen and Dr. Yi Zhang. Technical support of the high-resolution electron microscopy facility at MCPF of HKUST is hereby acknowledged.
Funding Information:
Y.???Z., N.???W., D.???Y.???L., and Y.???C. are thankful for the financial support from the Research Grants Council of Hong Kong (No. 15305718, No. C6021-14E, No. 16306818, No. 15303718 and No. 15201617). X.???L. is thankful for support from NSFC (No. 11804286 and No. 11832019), the Fundamental Research Funds for the Central Universities (No. 19lgpy263), and the resources of the National Supercomputer Center in Guangzhou. T.???Y.???Z. is thankful for support from NSFC (No. 21825103). Y.???Z is thankful for the helpful discussion from Dr. Zhen Chen and Dr. Yi Zhang. Technical support of the high-resolution electron microscopy facility at MCPF of HKUST is hereby acknowledged.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/7/24
Y1 - 2020/7/24
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85089365314&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.125.047601
DO - 10.1103/PhysRevLett.125.047601
M3 - Journal article
C2 - 32794817
AN - SCOPUS:85089365314
SN - 0031-9007
VL - 125
JO - Physical Review Letters
JF - Physical Review Letters
IS - 4
M1 - 047601
ER -