氢化物超导体中的非简谐性与非绝热性
Anharmonicity and Nonadiabaticity in Hydride Superconductors
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中文总结 AI 辅助
该研究采用非简谐声子等方法分析氢化物超导体，发现不同氢化物的非简谐与非绝热特性差异，引入A_λ与R_V作为诊断指标，为相关理论处理提供依据。
中文摘要 AI 辅助
我们采用非简谐声子、电声顶点修正及全带宽Eliashberg理论，研究典型氢化物的超导性。高压二元氢化物H₃S、YH₆、YH₉需同时考虑非简谐与非绝热修正；常压下的PdH/PdD/PdT系列虽具强非简谐性，但仍为绝热体系，能再现无显著顶点贡献的逆同位素效应。LaBeH₈表现出弱非简谐性，顶点修正使临界温度（Tc）降低约4 K，预测Tc仍高于实验值。为确定何时需超越简谐、绝热Migdal-Eliashberg理论的处理，我们引入非简谐重整化A_λ与顶点比R_V作为材料专属诊断指标。
英文摘要
We study superconductivity in representative hydrides using anharmonic phonons, electron-phonon vertex corrections, and full-bandwidth Eliashberg theory. The high-pressure binary hydrides H3S, YH6, and YH9 must be treated with both anharmonic and nonadiabatic corrections, whereas the ambient-pressure PdH/PdD/PdT series is strongly anharmonic but remains adiabatic, reproducing the inverse isotope effect without sizable vertex contributions. LaBeH8 exhibits weak anharmonicity, while vertex corrections reduce the critical temperature (Tc) by approximately 4 K, leaving the predicted Tc above experiment. To identify when treatments beyond harmonic, adiabatic Migdal-Eliashberg theory are required, we introduce the anharmonic renormalization $A_λ$ and the vertex ratio $R_{V}$ as material-specific diagnostics.
