Superconducting pairing mediated by spin fluctuations from first principles

F. Essenberger, A. Sanna, A. Linscheid, F. Tandetzky, G. Profeta, P. Cudazzo, E. K.U. Gross

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

We present the derivation of an ab initio and parameter-free effective electron-electron interaction that goes beyond the screened random phase approximation and accounts for superconducting pairing driven by spin fluctuations. The construction is based on many-body perturbation theory and relies on the approximation of the exchange-correlation part of the electronic self-energy within time-dependent density functional theory. This effective interaction is included in an exchange-correlation kernel for superconducting density functional theory in order to achieve a completely parameter free superconducting gap equation. First results from applying the new functional to a simplified two-band electron gas model are consistent with experiments.

Original languageAmerican English
Article number214504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number21
DOIs
StatePublished - 1 Dec 2014
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.

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