论文标题
修订后的Tolmachev-Morel-Anderson-pseudopitient，用于与非局部库仑相互作用的分层传统超导体
Revised Tolmachev-Morel-Anderson pseudopotential for layered conventional superconductors with nonlocal Coulomb interaction
论文作者
论文摘要
我们研究了分层常规超导体中静态非局部库仑相互作用的影响，并表明它们通常抑制超导性并降低临界温度。 Although the nonlocal Coulomb interaction leads to a significant structure in the superconducting gap function, we find that most properties can be effectively described by means of an appropriately revised local Coulomb pseudopotential $\tildeμ_C^*$, which is larger than the commonly adopted retarded Tolmachev-Morel-Anderson pseudopotential $μ^*_C$.为了理解这一点，我们分析了描述超导状态中库仑相互作用的伯特 - 盐方程，并获得$ \tildeμ_c^*$的表达式，该表达式在存在非局部库仑相互作用的情况下是有效的。该分析还揭示了非局部库仑相互作用的结构如何削弱高能对波动的筛选效应，因此产生了较大的假能力值。我们的发现对于具有较小的费米能量的分层常规超导体尤为重要，并且可以从头开始考虑。
We study the effects of static nonlocal Coulomb interactions in layered conventional superconductors and show that they generically suppress superconductivity and reduce the critical temperature. Although the nonlocal Coulomb interaction leads to a significant structure in the superconducting gap function, we find that most properties can be effectively described by means of an appropriately revised local Coulomb pseudopotential $\tildeμ_C^*$, which is larger than the commonly adopted retarded Tolmachev-Morel-Anderson pseudopotential $μ^*_C$. To understand this, we analyze the Bethe-Salpeter equation describing the screening of Coulomb interaction in the superconducting state and obtain an expression for $\tildeμ_C^*$, which is valid in the presence of nonlocal Coulomb interactions. This analysis also reveals how the structure of the nonlocal Coulomb interaction weakens the screening effects from high-energy pair fluctuations and therefore yields larger values of the pseudopotential. Our findings are especially important for layered conventional superconductors with small Fermi energies and can be easily taken into account ab initio studies.
