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

Abstract

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.

13 pages, 15 figures

References in corpus (3)

• Continuous-time auxiliary field Monte Carlo for quantum impurity models
• Doping Dependence of the Redistribution of Optical Spectral Weight in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Quantum Monte Carlo Study of a Dynamic Hubbard Model

Cited by in corpus (4)

• Understanding electron-doped cuprate superconductors as hole superconductors
• Effect of orbital relaxation on the band structure of cuprate superconductors and implications for the superconductivity mechanism
• Optical conductivity for a dimer in the Dynamic Hubbard model
• Dynamic Hubbard model for solids with hydrogen-like atoms