Strongly bound yet light bipolarons for double-well electron-phonon coupling
arXiv:1406.3072 · doi:10.1103/PhysRevB.90.085149
Abstract
We use the Momentum Average approximation (MA) to study the ground-state properties of strongly bound bipolarons in the double-well electron-phonon (el-ph) coupling model, which describes certain intercalated lattices where the linear term in the el-ph coupling vanishes due tosymmetry. We show that this model predicts the existence of strongly bound yet lightweight bipolarons in some regions of the parameter space. This provides a novel mechanism for the appearance of such bipolarons, in addition to long-range el-ph coupling and special lattice geometries.
7 pages, 7 figures
References in corpus (8)
- Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2O8+d
- Green's function of a dressed particle
- The Green's Function of the Holstein Polaron
- Two-dimensional Hubbard-Holstein bipolaron
- Interplay between electron-phonon and Coulomb interactions in cuprates
- Superlight small bipolarons in the presence of strong Coulomb repulsion
- Distribution of Localized States from Fine Analysis of Electron Spin Resonance Spectra in Organic Transistors
- Single polaron properties for double-well electron-phonon coupling