室温下钙钛矿拓扑谷激子极化的观察

IF 15.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Feng Jin, Subhaskar Mandal, Jinqi Wu, Zhenhan Zhang, Wen Wen, Jiahao Ren, Baile Zhang, Timothy C. H. Liew, Qihua Xiong, Rui Su
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引用次数: 0

摘要

拓扑激子-极化子是一类新兴的拓扑光子系统,其特点是半光半物质准粒子的混合性质。他们对新型谷自由度(DOF)的进一步控制为开发用于信息处理的有源拓扑光学器件提供了相当大的潜力。本文采用二维(2D)谷-霍尔钙钛矿晶格,报道了在室温下谷极化拓扑激子-极化子及其谷相关传播的实验观察。二维山谷-霍尔钙钛矿晶格由两个相互倒置的蜂窝晶格组成,具有破碎的反演对称性。通过角分辨光致发光光谱测量其能带结构,在室温下实验验证了在络膜界面中存在~ 9 meV大间隙开度的谷极化极化拓扑扭结态。此外,在室温下,这些谷极化态在共振激励下表现出反传播行为。我们的研究结果不仅拓展了实现拓扑激子-极化子的领域,而且为室温下具有谷自由度的激子-极化子拓扑谷电子器件的发展铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Observation of perovskite topological valley exciton-polaritons at room temperature

Observation of perovskite topological valley exciton-polaritons at room temperature

Topological exciton-polaritons are a burgeoning class of topological photonic systems distinguished by their hybrid nature as part-light, part-matter quasiparticles. Their further control over novel valley degree of freedom (DOF) has offered considerable potential for developing active topological optical devices towards information processing. Here, employing a two-dimensional (2D) valley-Hall perovskite lattice, we report the experimental observation of valley-polarized topological exciton-polaritons and their valley-dependent propagations at room temperature. The 2D valley-Hall perovskite lattice consists of two mutually inverted honeycomb lattices with broken inversion symmetry. By measuring their band structure with angle-resolved photoluminescence spectra, we experimentally verify the existence of valley-polarized polaritonic topological kink states with a large gap opening of ~ 9 meV in the bearded interface at room temperature. Moreover, these valley-polarized states exhibit counter-propagating behaviors under a resonant excitation at room temperature. Our results not only expand the landscape of realizing topological exciton-polaritons, but also pave the way for the development of topological valleytronic devices employing exciton-polaritons with valley DOF at room temperature.

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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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