Chiral breathing-valley locking in two-dimensional kagome lattice Ta3I8

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-02-13 DOI:10.1063/5.0193656

Jiajun Lu, Hongxin Chen, Xiuwen Zhao, Guichao Hu, Xiaobo Yuan, Junfeng Ren

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Abstract

The exploration of valley-related physics is essential to the development and refinement of valleytronics. Here, a paradigm called chiral breathing-valley locking (CBVL) is proposed, in which two chiral “breathing” phases are completely locked to their valley indexes. Utilizing first-principles calculations, a two-dimensional (2D) kagome lattice with large spontaneous valley polarization (VP), namely, monolayer Ta3I8, is proposed to realize CBVL. There are two breathing phases with chiral symmetry in Ta3I8, and they can change to each other under some conditions. The valley indexes change between “−K” and “K” along the breathing of the two chiral symmetric phases, so CBVL can be obtained. Remarkably, the VP is up to 199.7 meV, so CBVL can cause the obvious switching of the anomalous valley Hall effect (AVHE). Additionally, a 2D Janus Kagome structure TaI4X4 is constructed to confirm experimentally the feasibility of electric field modulation on the CBVL. The built-in electric field and the breathing mode can mutually influence each other in TaI4X4, which provides a synergistic regulation of the AVHE. Our findings broaden the horizon for exploring AVHE materials and provide a platform for future valleytronic applications.

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二维神目晶格 Ta3I8 中的手性呼吸谷锁定

探索与谷相关的物理学对谷电学的发展和完善至关重要。这里提出了一种称为手性呼吸-谷锁定（CBVL）的范例，在这种范例中，两个手性 "呼吸 "相完全锁定在它们的谷指数上。利用第一原理计算，提出了一种具有大自发谷极化（VP）的二维（2D）卡戈米晶格，即单层 Ta3I8，来实现 CBVL。Ta3I8 中存在两种手性对称的呼吸相，它们在某些条件下可以相互转换。沿着两个手性对称相的呼吸方向，谷指数在"-K "和 "K "之间变化，因此可以获得 CBVL。值得注意的是，VP 高达 199.7 meV，因此 CBVL 可以引起反常谷霍尔效应（AVHE）的明显切换。此外，为了从实验上证实电场调制对 CBVL 的可行性，我们还构建了二维 Janus Kagome 结构 TaI4X4。在 TaI4X4 中，内置电场和呼吸模式可以相互影响，从而提供了对 AVHE 的协同调节。我们的发现拓宽了探索 AVHE 材料的视野，并为未来的峡谷电子应用提供了一个平台。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.