Polarons shape the interlayer exciton emission of MoSe₂/WSe₂ heterobilayers.

IF 15.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2025-10-01 DOI:10.1038/s41467-025-64176-6

Pedro Soubelet, Alex Delhomme, Elena Blundo, Andreas V Stier, Jonathan J Finley

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Abstract

We present evidence for the strong participation of hot phonons in the photo-physics of interlayer excitons (IXs) in 2H - and 3R - stacked MoSe₂/WSe₂ heterobilayers. Photoluminescence (PL) excitation spectroscopy reveals that excess energy associated with relaxation of intra-layer excitons towards IXs profoundly shapes the overall IX-PL lineshape, while the energy of the spectrally narrow discrete emission lines conventionally associated with trapped moiré IXs remain unaffected. A strikingly uniform line-spacing of the discrete emission lines is observed, along with characteristic temperature and excitation level dependence. Results suggest an entirely new picture of the discrete IX emission in which non-thermal phonons play a crucial role in shaping the spectrum. Excitation power and time resolved data indicate that these features are most likely polaronic in nature. Our findings extend the understanding of the photophysics of IXs beyond current interpretations based primarily on moiré-trapped IXs.

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极化子影响MoSe2/WSe2异质层的层间激子发射。

我们提出了热声子在2H -和3R -堆叠MoSe2/WSe2异质层中层间激子（IXs）光物理中的强烈参与的证据。光致发光（PL）激发光谱显示，与层内激子向IXs松弛相关的多余能量深刻地塑造了IX-PL的整体线形状，而通常与捕获的moiroir IXs相关的光谱窄离散发射线的能量不受影响。观察到离散发射线的均匀线距，以及特征温度和激发能级的依赖性。结果提出了一个全新的离散IX发射图像，其中非热声子在形成光谱中起着至关重要的作用。激发功率和时间分辨数据表明，这些特征在本质上很可能是极极性的。我们的研究结果扩展了对IXs光物理的理解，超越了目前主要基于莫尔海姆阱IXs的解释。

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

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.