Iterative Perturbation Theory for Strongly Correlated Electron Systems with Orbital Degeneracy

Abstract

A new scheme of the iterative perturbation theory is proposed for the strongly correlated electron systems with orbital degeneracy. The method is based on the modified self-energy of Yeyati, et al. which interpolates between the weak and the strong correlation limits, but a much simpler scheme is proposed which is useful in the case of the strong correlation with orbital degeneracy. It will be also useful in the study of the electronic structures combined with the band calculations.

6 pages, 3 Postscript figures, to appear in J. Phys. Cond. Matter

References in corpus (3)

• A Unified Theory of Dynamical Mean Field and Spin Fluctuations
• Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field
• Investigation of the Two-Particle-Self-Consistent Theory for the Single-Impurity Anderson Model and an Extension to the Case of Strong Correlation

Cited by in corpus (4)

• Benchmark of a modified Iterated Perturbation Theory approach on the 3d FCC lattice at strong coupling
• Equation of Motion Series Expansion of Double Time Green's Functions
• Development of an efficient impurity solver in dynamical mean field theory for multi-band systems: The iterative perturbation theory combined with the parquet equations
• Simplification of the local full vertex in the impurity problem in DMFT and its applications for the nonlocal correlation