Electron–phonon (e–p) coupling plays a crucial role in various physical phenomena, and regulation of e–p coupling is vital for the exploration and design of high-performance materials. However, the current research on this topic lacks accurate quantification, hindering further understanding of the underlying physical processes and its applications. In this work, we demonstrate quantitative regulation of e–p coupling, by pressure engineering and in-situ spectroscopy. We successfully observe both a distinct vibrational mode and a strong Stokes shift in layered CrBr₃, which are clear signatures of e–p coupling. This allows us to achieve precise quantification of the Huang–Rhys factor S at the actual sample temperature, thus accurately determining the e–p coupling strength. We further reveal that pressure efficiently regulates the e–p coupling in CrBr₃, evidenced by a remarkable 40% increase in S value. Our results offer an approach for quantifying and modulating e–p coupling, which can be leveraged for exploring and designing functional materials with targeted e–p coupling strengths.

中文翻译：

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电子声子耦合的定量调控


电子-声子（e-p）耦合在各种物理现象中起着至关重要的作用，e-p耦合的调控对于高性能材料的探索和设计至关重要。然而，目前关于这一主题的研究缺乏准确的量化，阻碍了对潜在物理过程及其应用的进一步理解。在这项工作中，我们通过压力工程和原位光谱学。我们成功地观察到层状 CrBr ₃中独特的振动模式和强烈的斯托克斯位移，这是 e-p 耦合的清晰特征。这使我们能够实现黄-里斯因子的精确量化S在实际样品温度下，从而准确确定 e-p 耦合强度。我们进一步揭示了压力有效地调节了 CrBr ₃中的 e-p 耦合，这可以通过显着增加 40% 来证明。 S价值。我们的结果提供了一种量化和调节 e-p 耦合的方法，可用于探索和设计具有目标 e-p 耦合强度的功能材料。