title: Correlation effects on the dynamics of bipolarons in nondegenerate conjugated polymers.
abstract: By employing an adaptive time-dependent density-matrix-renormalization-group method, we investigate the dynamics of a charged bipolaron in the presence of both electron-phonon and electron-electron interactions. We use a Su-Schrieffer-Heeger model modified to include electron-electron interactions via a Hubbard Hamiltonian, a Brazovskii-Kirova symmetry-breaking term, and an external electric field. Our results show that the velocity of the bipolaron increases first and then decreases with the increasing of the on-site Coulomb interaction, U. Furthermore, the dependence of the bipolaron velocity, bipolaron effective mass, and bipolaron stability on the lattice structures is discussed.
authors: Department of Physics, Tongji University, Shanghai 200092, China. zhaoh@fudan.edu.cn
authors: Hui
authors: H
authors: Zhao
authors: Yu-Guang
authors: YG
authors: Chen
authors: Xu-Ming
authors: XM
authors: Zhang
authors: Zhong
authors: Z
authors: An
authors: Chang-Qin
authors: CQ
authors: Wu
mesh_terms: D003198:Computer Simulation; D004583:Electrons; D008956:Models, Chemical; D011108:Polymers / Q000737:chemistry*; D013997:Time Factors
chemical_list: D011108:Polymers