Polarization-Controlled Structural Modulation in the Single Atomic Layer at the PbZr0.2Ti0.8O3/LaNiO3 Interface

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-10-06 DOI:10.1021/acs.nanolett.5c01956

Soo-Yoon Hwang, Sangjae Lee, Ankit S. Disa, Cristina Visani, Si-Young Choi, Frederick J. Walker, Charles H. Ahn, Yimei Zhu, Myung-Geun Han

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Abstract

Conductivity modulation via ferroelectric polarization coupling with LaNiO₃ (LNO) is demonstrated at an epitaxial ferroelectric–LNO interface. Conductivity measurements, varying the thickness of the LNO channel, show that this phenomenon is confined to a few atomic layers at the interface. Combining in situ biasing and off-axis holography, we mapped out electrostatic potentials at the PbZr0_.2Ti_0.8O₃(PZT)/LNO/SrTiO₃(STO) heterostructure upon polarization switching. Using aberration-corrected STEM, the interfacial atomic structures were investigated for the two different PZT polarization states. Polarization in PZT induces a significant change in the in-plane O–Ni–O bond angles, with a 37° modulation in the topmost 1 or 2 LNO unit cells, driven by strain in the oxygen sublattice for the two opposite polarization directions in PZT. Both oxygen and cation sublattices exhibit strain responses exceeding 10% upon switching. This atomic-layer structural modulation highlights a mechanism for functional oxide heterostructure development, offering pathways for advancements in nonvolatile memory, sensors, and energy-efficient transistors.

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PbZr0.2Ti0.8O3/LaNiO3界面单原子层偏振控制结构调制

在外延铁电- LNO界面上，通过铁电极化耦合与LaNiO3 （LNO）实现了电导率调制。改变LNO通道厚度的电导率测量表明，这种现象仅限于界面上的几个原子层。结合原位偏置和离轴全息技术，我们绘制了偏振开关时PbZr0.2Ti0.8O3(PZT)/LNO/SrTiO3（STO）异质结构的静电电位图。利用像差校正的STEM，研究了两种不同偏振态PZT的界面原子结构。PZT中的极化引起了平面内O-Ni-O键角的显著变化，在氧亚晶格中的应变驱动下，PZT中两个相反极化方向的O-Ni-O键角在最上面的1或2 LNO单元胞中发生37°调制。氧亚晶格和阳离子亚晶格在开关时均表现出超过10%的应变响应。这种原子层结构调制强调了功能氧化物异质结构发展的机制，为非易失性存储器、传感器和节能晶体管的进步提供了途径。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.