AI 中文总结
研究扭曲WSe2和MoTe2中配对驱动因素，结合拉曼光谱与机器学习计算EPC，发现晶格重构干涉规则，该规则选择特定呼吸模式，使耦合在大扭转角处达峰值，表明声子对大角度配对有显著贡献。
AI 中文摘要
最近在扭曲的WSe2和MoTe2中观察到超导性，引发了一个核心问题：配对是由电子关联、声子还是两者共同驱动？回答这个问题需要确定这些莫尔半导体中的电子-声子耦合（EPC），而在数千个原子的实际超胞中计算EPC超出了直接第一性原理方法的范围。本文将依赖填充的拉曼光谱与机器学习第一性原理计算相结合，以在多达数万个原子的超胞中逐个模式地获得EPC。拉曼光谱仅揭示了少数频率随填充强烈变化的莫尔声子，通过干涉选择规则来解释这一现象，该规则表明当声子的位移纹理与静态晶格重构模式匹配时，声子耦合强烈，否则会被相消干涉抑制。该规则选择了拉曼光谱中观察到的低频和高频呼吸模式，并使耦合在大扭转角处达到峰值，接近超导出现的角度。因此，晶格重构干涉成为莫尔EPC的组织原则，表明声子对大角度配对有显著的、可能占主导的贡献。
英文摘要
Superconductivity was recently observed in twisted WSe2 and MoTe2, raising a central question: is the pairing driven by electronic correlations, by phonons, or by both? Answering it requires determining the electron-phonon coupling (EPC) in these moiré semiconductors, whose calculation in realistic supercells of thousands of atoms lies beyond the reach of direct first-principles methods. Here we combine filling-dependent Raman spectroscopy with machine-learning first-principles calculations to obtain the EPC mode by mode in supercells of up to tens of thousands of atoms. Raman reveals only a few moiré phonons whose frequencies shift strongly with filling; we trace this to an interference selection rule: a phonon couples strongly only when its displacement texture matches the static lattice-reconstruction pattern, and is otherwise suppressed by destructive interference. The rule selects the low- and high-frequency breathing modes seen in Raman and makes the coupling peak at large twist angles, near those at which superconductivity appears. Lattice-reconstruction interference thus emerges as an organizing principle for moiré EPC, pointing to a substantial, potentially dominant, phonon contribution to large-angle pairing.
