Two-site dynamical mean field theory for the dynamic Hubbard model

Details Two-site dynamical mean field theory for the dynamic Hubbard model Two-site dynamical mean field theory for the dynamic Hubbard model

2010-08-23

arxiv.org/abs/1008.3905v1

Phys. Rev. B 82, 155122 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 15 figures

Scientific paper

10.1103/PhysRevB.82.155122

At zero temperature, two-site dynamical mean field theory is applied to the Dynamic Hubbard model. The Dynamic Hubbard model describes the orbital relaxation that occurs when two electrons occupy the same site, by using a two-level boson field at each site. At finite boson frequency, the appearance of a Mott gap is found to be enhanced even though it shows a metallic phase with the same bare on-site interaction $U$ in the conventional Hubbard model. The lack of electron-hole symmetry is highlighted through the quasi-particle weight and the single particle density of states at different fillings, which qualitatively differentiates the dynamic Hubbard model from other conventional Hubbard-like models.

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