On Electron Pairing in One-Dimensional Anharmonic Crystal Lattices

TL;DR

This paper demonstrates that anharmonicity in electron-phonon interactions promotes electron pairing in localized states within one-dimensional crystal lattices, even with Coulomb repulsion.

Contribution

It introduces a mechanism where anharmonicity enables electron pairing via localized lattice solitons, a novel insight into electron pairing in anharmonic lattices.

Findings

Electron pairing occurs in localized states due to anharmonicity.

Localized electron pairs form singlet states bound to lattice solitons.

Pairing persists despite Coulomb repulsion.

Abstract

We show that when anharmonicity is added to the electron-phonon interaction it facilitates electron pairing in a localized state. Such localized state appears as singlet state of two electrons bound with the traveling local lattice soliton distortion which survives when Coulomb repulsion is included.