Dynamic Hubbard Model: Effect of Finite Boson Frequency

Details Dynamic Hubbard Model: Effect of Finite Boson Frequency Dynamic Hubbard Model: Effect of Finite Boson Frequency

2003-07-23

arxiv.org/abs/cond-mat/0307594v1

Phys. Rev. B 68, 224507 (2003)

Physics

Condensed Matter

Superconductivity

8 pages 3 figures

Scientific paper

10.1103/PhysRevB.68.224507

Dynamic Hubbard models describe coupling of a boson degree of freedom to the on-site electronic double occupancy. In the limit of infinite boson frequency this coupling gives rise to a correlated hopping term in the effective Hamiltonian and to superconductivity when the Fermi level is near the top of the band. Here we study the effect of finite boson frequency through a generalized Lang-Firsov transformation and a high frequency expansion. It is found that finite frequency enhances the tendency to superconductivity in this model.

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