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- W3100210655 abstract "Competing interactions are often responsible for intriguing phase diagrams in correlated electron systems. Here we analyze the competition of instantaneous short-range Coulomb interaction U with the retarded electron-electron interaction induced by an electron-phonon coupling g as described by the Hubbard-Holstein model. The ground-state phase diagram of this model in the limit of large dimensions at half-filling is established. The study is based on dynamical mean-field theory combined with the numerical renormalization group. Depending on U, g, and the phonon frequency ω0, the ground state is antiferromagnetically (AFM) or charge ordered (CO). We find quantum phase transitions from the AFM to CO state to occur when U-λ≃0, where λ characterizes the phonon-induced effective attraction. The transition is continuous for small couplings and large phonon frequencies ω0 and becomes discontinuous for large couplings and small values of ω0. We comment on the possible relevance of this work for Ba1- xKxBiO3." @default.
- W3100210655 created "2020-11-23" @default.
- W3100210655 creator A5004702414 @default.
- W3100210655 date "2010-04-01" @default.
- W3100210655 modified "2023-09-27" @default.
- W3100210655 title "Competing interactions and symmetry breaking in the Hubbard-Holstein model" @default.
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- W3100210655 doi "https://doi.org/10.1209/0295-5075/90/27002" @default.
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