Anisotropic Migdal-Eliashberg theory using Wannier functions

被引：318

作者：

Margine, E. R. ^{[1
]}

Giustino, F. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 02期

基金：

欧洲研究理事会;

关键词：

SUPERCONDUCTING ENERGY-GAP; NONADIABATIC SUPERCONDUCTIVITY; TRANSITION-TEMPERATURE; ELECTRON; EQUATIONS; STATE; MGB2; PSEUDOPOTENTIALS; CONTINUATION; MODEL;

D O I：

10.1103/PhysRevB.87.024505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We combine the fully anisotropic Migdal-Eliashberg theory with electron-phonon interpolation based on maximally localized Wannier functions, in order to perform reliable and highly accurate calculations of the anisotropic temperature-dependent superconducting gap and critical temperature of conventional superconductors. Compared with the widely used McMillan approximation, our methodology yields a more comprehensive and detailed description of superconducting properties, and is especially relevant for the study of layered or low-dimensional systems as well as systems with complex Fermi surfaces. In order to validate our method we perform calculations on two prototypical superconductors, Pb and MgB2, and obtain good agreement with previous studies. DOI: 10.1103/PhysRevB.87.024505

引用

页数：12

共 87 条

[1] TRANSITION-TEMPERATURE OF STRONG-COUPLED SUPERCONDUCTORS REANALYZED [J].