Two-dimensional Hubbard-Holstein bipolaron

Simple item page
dc.creatorMacridin, Alexandru
dc.creatorSawatzky, George. A.
dc.creatorJarrell, Mark
dc.date2004-01-16
dc.date.accessioned2026-07-07T02:55:56Z
dc.date.available2026-07-07T02:55:56Z
dc.descriptionWe present a diagrammatic Monte Carlo study of the properties of the Hubbard-Holstein bipolaron on a two-dimensional square lattice. With a small Coulomb repulsion, U, and with increasing electron-phonon interaction, and when reaching a value about two times smaller than the one corresponding to the transition of light polaron to heavy polaron, the system suffers a sharp transition from a state formed by two weakly bound light polarons to a heavy, strongly bound on-site bipolaron. Aside from this rather conventional bipolaron a new bipolaron state is found for large U at intermediate and large electron-phonon coupling, corresponding to two polarons bound on nearest-neighbor sites. We discuss both the properties of the different bipolaron states and the transition from one state to another. We present a phase diagram in parameter space defined by the electron-phonon coupling and U. Our numerical method does not use any artificial approximation and can be easily modified to other bipolaron models with longer range electron-phonon and/or electron-electron interaction.
dc.description14 pages, 12 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0401305
dc.identifierhttp://arxiv.org/abs/cond-mat/0401305
dc.identifierPhys. Rev. B 69, 245111 (2004)
dc.identifierdoi:10.1103/PhysRevB.69.245111
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23131
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleTwo-dimensional Hubbard-Holstein bipolaron
dc.typetext

Files

Collections

arXiv