Interband Electron Pairing for Superconductivity from the Breakdown of the Born‐Oppenheimer Approximation

The origin of interband electron pairing, responsible for enhancing superconductivity, and the factors controlling its strength were examined. We show that interband electron pairing is a natural consequence of breaking down the Born‐Oppenheimer approximation during electron‐phonon interactions. Its...

Full description

Saved in:
Bibliographic Details
Published in:Chemphyschem 2018-12, Vol.19 (23), p.3191-3195
Main Authors: Whangbo, Myung‐Hwan, Deng, Shuiquan, Köhler, Jürgen, Simon, Arndt
Format: Article
Language:English
Subjects:
Approximation
Born-Oppenheimer approximation
Electrons
Fermi surfaces
interband electron pairing
Mathematical analysis
metals
multiband superconductivity
Superconductivity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The origin of interband electron pairing, responsible for enhancing superconductivity, and the factors controlling its strength were examined. We show that interband electron pairing is a natural consequence of breaking down the Born‐Oppenheimer approximation during electron‐phonon interactions. Its strength is determined by the pair‐state excitations around the Fermi surfaces that take place to form a superconducting state. Fermi surfaces favorable for the pairing were found, and the implications of this observation are discussed. Interband electron pairing enhancing the superconductivity is shown to arise from the breakdown of the Born‐Oppenheimer approximation. This pairing is more likely to occur in 2D layered metals than in 3D metals and becomes favorable when two Fermi surfaces are very similar or nested.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201800738