@article{94345acd9c364c2da9c366acdfd2c6fd,
title = "Phase and polarization modulation in two-dimensional In2Se3 via in situ transmission electron microscopy",
abstract = "Phase transitions in two-dimensional (2D) materials promise reversible modulation of material physical and chemical properties in a wide range of applications. 2D van der Waals layered In2Se3 with bistable out-of-plane ferroelectric (FE) α phase and antiferroelectric (AFE) β′ phase is particularly attractive for its electronic applications. However, reversible phase transition in 2D In2Se3 remains challenging. Here, we introduce two factors, dimension (thickness) and strain, which can effectively modulate the phases of 2D In2Se3. We achieve reversible AFE and out-of-plane FE phase transition in 2D In2Se3 by delicate strain control inside a transmission electron microscope. In addition, the polarizations in 2D FE In2Se3 can also be manipulated in situ at the nanometer-sized contacts, rendering remarkable memristive behavior. Our in situ transmission electron microscopy (TEM) work paves a previously unidentified way for manipulating the correlated FE phases and highlights the great potentials of 2D ferroelectrics for nanoelectromechanical and memory device applications.",
author = "Xiaodong Zheng and Wei Han and Ke Yang and Wong, {Lok Wing} and Tsang, {Chi Shing} and Lai, {Ka Hei} and Fangyuan Zheng and Tiefeng Yang and Lau, {Shu Ping} and Ly, {Thuc Hue} and Ming Yang and Jiong Zhao",
note = "Funding Information: Acknowledgments Funding: This work was supported by the National Natural Science Foundation of China (grant nos. 51872248, 51922113, 52173230, and 22105162), Hong Kong Research Grant Council Collaborative Research Fund (project no. C5029-18E), Early Career Scheme (project no. 25301018), the Hong Kong Research Grant Council General Research Fund (project nos. 11312022, 11300820 and 15302419), the City University of Hong Kong (project nos. 6000758 and 9229074), The Hong Kong Polytechnic University (project nos. 1-ZVGH, ZVRP, 1-BE47, and ZE2F), and the Shenzhen Science, Technology and Innovation Commission (project no. JCYJ20200109110213442). Author contributions: J.Z., M.Y., and T.H.L. conceived and led the project. X.Z., W.H., L.W.W., C.S.T., S.P.L., T.H.L., and J.Z. prepared the samples and conducted the sample characterizations and TEM experiments. K.Y. and M.Y conducted the DFT simulations. K.H.L. and F.Z. assisted with the TEM experiments. T.Y. conducted the AFM tests. All the authors discussed the manuscript (MS) and agreed on its contents. Competing interests: The authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and the Supplementary Materials. Publisher Copyright: Copyright {\textcopyright} 2022 The Authors,",
year = "2022",
month = oct,
doi = "10.1126/sciadv.abo0773",
language = "English",
volume = "8",
journal = "Science advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "42",
}