论文标题
传统超导体中电子音波耦合的动力重归其化
Dynamical renormalization of electron-phonon coupling in conventional superconductors
论文作者
论文摘要
绝热的爆发症近似被认为是一种很少分解的强大方法。因此，它主要用于解决冷凝物理物理学中各种电子phonon特性。通过结合多体扰动和密度功能理论，我们证明了动态（非绝热）效应在估计各种体积和二维材料中超导性能中的重要性。除了预期的长波长非绝热效应外，我们还发现远离布里鲁因区域材料中心具有强大的Intervelley Electron-Phonon散射材料中心。与绝热的结果相比，这些动态的声子异常可以显着修改电子偶联强度$λ$和超导转换温度$ t_c $。此外，动态诱导的$λ$的修改对运输特性具有很大的影响，其中最有趣的是，散射时间$ 1/τ$从约$ t^3 $ to $ t^2 $重新缩放了$ 1/τ$的$ 1/τ$，类似于fermi液体液体结果的电子液体结果。我们的目标是指出这些非绝热效应的潜在含义，并重新建立它们在电子phonon特性计算估计中的关键作用。
The adiabatic Born-Oppenheimer approximation is considered to be a robust approach that very rarely breaks down. Consequently, it is predominantly utilized to address various electron-phonon properties in condensed matter physics. By combining many-body perturbation and density functional theories we demonstrate the importance of dynamical (nonadiabatic) effects in estimating superconducting properties in various bulk and two-dimensional materials. Apart from the expected long-wavelength nonadiabatic effects, we found sizable nonadiabatic Kohn anomalies away from the Brillouin zone center for materials with strong intervalley electron-phonon scatterings. Compared to the adiabatic result, these dynamical phonon anomalies can significantly modify electron-phonon coupling strength $λ$ and superconducting transition temperature $T_c$. Further, the dynamically-induced modifications of $λ$ have a strong impact on transport properties, where probably the most interesting is the rescaling of the low-temperature and low-frequency regime of the scattering time $1/τ$ from about $T^3$ to about $T^2$, resembling the Fermi liquid result for electron-electron scattering. Our goal is to point out the potential implications of these nonadiabatic effects and reestablish their pivotal role in computational estimations of electron-phonon properties.
