Origin of Chiral Phase Transition of Polar Vortex in Ferroelectric/Dielectric Superlattices

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-01-13 DOI:10.1021/acs.nanolett.4c0506710.1021/acs.nanolett.4c05067

Sizheng Zheng, Jingtong Zhang, Ailin Li and Jie Wang*,

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Abstract

Chiral vortices and their phase transition in ferroelectric/dielectric heterostructures have drawn significant attention in the field of condensed matter. However, the dynamical origin of the chiral phase transition from achiral to chiral polar vortices has remained elusive. Here, we develop a phase-field perturbation model and discover the softening of out-of-plane vibration mode of polar vortices in [(PbTiO₃)_m/(SrTiO₃)_m]_n superlattices at a critical epitaxial strain or temperature. The softening of the mode leads to the appearance of the axial polarization at vortex cores, resulting in chiral phase transition. It is found that the local negative permittivity plays a crucial role in the enhanced oscillation of axial polarization near the phase transition. Our findings not only reveal the origin of the chiral phase transition of polar vortices but also provide considerable new insight into the dynamics of topological structures and topological phase transitions in ferroelectric systems.

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铁电/介电超晶格中极涡手性相变的起源

铁电/介电异质结构中的手性涡及其相变在凝聚态物质领域引起了广泛的关注。然而，从非手性极性涡到手性极性涡的手性相变的动力学起源仍然是难以捉摸的。在此，我们建立了相场扰动模型，并发现在临界外延应变或温度下，[(PbTiO3)m/(SrTiO3)m]n超晶格中极性涡的面外振动模式软化。模态的软化导致涡旋核心处出现轴向极化，导致手性相变。发现局部负介电常数对相变附近轴向极化振荡的增强起着至关重要的作用。我们的发现不仅揭示了极涡手性相变的起源，而且为铁电系统的拓扑结构和拓扑相变动力学提供了重要的新见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.