纳米腔耦合扭曲范德华异质结构中动量禁止层间激子的室温强发射

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-01-08 DOI:10.1021/acs.nanolett.4c05647

Bin Feng, Shixuan Zhao, Ilya Razdolski, Feihong Liu, Zhiwei Peng, Yaorong Wang, Zhedong Zhang, Zhenhua Ni, Jianbin Xu, Dangyuan Lei

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引用次数: 0

摘要

扭曲二维异质结构层间激子（IEs）的发射效率长期存在动量失配问题，限制了其在超紧凑激子器件中的应用。在这里，我们报道了30°扭曲的MoS2/WS2异质层中强烈的室温禁动量IE发射。利用等离子体纳米腔，珀塞尔效应将腔内的IE发射强度提高了2个数量级以上。我们进一步研究了珀塞尔增强和声子辅助在30°和0°扭曲异质结构中的相互作用。温度依赖光谱和时间分辨光谱表明，30°扭转情况下的IE增强涉及IE和层内激子发射之间的竞争，这与0°扭转情况明显不同。我们提出了一个综合的激子衰变模型，该模型捕捉了声子辅助动量补偿和IE发射的Purcell增强的特征，显示了与实验测量的一致性。我们的研究结果丰富了对纳米腔辅助光-物质相互作用在动量间接激子跃迁中的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Room-Temperature, Strong Emission of Momentum-Forbidden Interlayer Excitons in Nanocavity-Coupled Twisted van der Waals Heterostructures

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Room-Temperature, Strong Emission of Momentum-Forbidden Interlayer Excitons in Nanocavity-Coupled Twisted van der Waals Heterostructures

The emission efficiency of interlayer excitons (IEs) in twisted 2D heterostructures has long suffered from momentum mismatch, limiting their applications in ultracompact excitonic devices. Here, we report strong room-temperature emission of momentum-forbidden IE in 30°-twisted MoS₂/WS₂ heterobilayers. Utilizing a plasmonic nanocavity, the Purcell effect boosts the IE emission intensity in the cavity by over 2 orders of magnitude. We further study the interplay of this Purcell enhancement and phonon assistance in 30°- and 0°-twisted heterostructures. Temperature-dependent and time-resolved spectroscopy reveal that the IE enhancement in 30°-twisted cases involves competition between IEs and intralayer excitonic emission, which is remarkably distinct from the 0°-twisted cases. We propose a comprehensive exciton decay model capturing the features of the phonon-assisted momentum compensation and the Purcell enhancement of the IE emission, showing consistency with the experimental measurements. Our results enrich the understanding of the nanocavity-assisted light–matter interaction for momentum-indirect excitonic transitions.

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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.