Efficient ab initio Migdal-Eliashberg calculation considering the retardation effect in phonon-mediated superconductors

Tianchun Wang, Takuya Nomoto, Yusuke Nomura, Hiroshi Shinaoka, Junya Otsuki, Takashi Koretsune, Ryotaro Arita

研究成果: Article査読

6 被引用数 (Scopus)

抄録

We formulate an efficient scheme to perform a Migdal-Eliashberg calculation considering the retardation effect from first principles. While the conventional approach requires a huge number of Matsubara frequencies, we show that the intermediate representation of the Green's function [H. Shinaoka, Phys. Rev. B 96, 035147 (2017)10.1103/PhysRevB.96.035147] dramatically reduces the numerical cost to solve the linearized gap equation. Without introducing any empirical parameter, we obtain a superconducting transition temperature of elemental Nb (∼10 K), which is consistent with experiment. The present result indicates that our approach has a superior performance for many superconductors for which Tc is lower than O(10) K.

本文言語English
論文番号134503
ジャーナルPhysical Review B
102
13
DOI
出版ステータスPublished - 2020 10 8

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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