Modulation of interlayer coupling in bilayer MoS2 through Li+ intercalation

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-17 DOI:10.1063/5.0274168

Xiaoyue Fan, Ziling Shen, Haochen Zhang, Hanting Li, Yuqing Zheng, Wenchen Yang, Di Lin, Chong Wang, Gang Wang

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Abstract

The interlayer coupling of layered two-dimensional (2D) materials plays a crucial role in their physical properties. As an additional degree of freedom of 2D materials, the modulation of interlayer distance has emerged as a prominent research focus. In this work, we modulated the interlayer distance of bilayer MoS2 by introducing lithium ions (Li+) through intercalation, thereby changing the interlayer coupling. Experimental results reveal significant responses in the absorption peaks of both intra- and interlayer excitons following Li+ intercalation. Specifically, the energy difference between A and B excitons decreased, and the oscillator strength of interlayer excitons diminished. The deduced interlayer distance expanded from 0.60 to 0.62 nm, confirming the intercalation of Li+. The electrical measurements and differential reflectance spectra demonstrated the reversibility of this intercalation process. These findings offer a dedicated strategy for modulating the excitonic states by controlling the interlayer distance in van der Waals (vdW) bilayer systems.

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Li+嵌入对双层MoS2层间耦合的调制

层状二维材料的层间耦合对其物理性能起着至关重要的作用。作为二维材料的一个额外的自由度，层间距离的调制已经成为一个突出的研究热点。在这项工作中，我们通过插入引入锂离子（Li+）来调节双层MoS2的层间距离，从而改变层间耦合。实验结果表明，在Li+插入后，层内和层间激子的吸收峰都有显著的响应。具体来说，A和B激子之间的能量差减小，层间激子的振荡强度减弱。推导出的层间距离从0.60 nm扩大到0.62 nm，证实了Li+的插入。电测量和微分反射光谱证明了该插层过程的可逆性。这些发现提供了一种通过控制范德华双层体系的层间距离来调节激子态的专用策略。

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.