Self-consistent projection operator method for the single-particle excitation spectrum

• Published in: Journal of magnetism and magnetic materials Vol. 272; pp. 400 - 401
• Main Authors: Kakehashi, Y, Fulde, P
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2004
• Subjects: Many-body coherent potential approximation; Metal–insulator transition; Projection operator method; 71.10.Fd; 71.10.Li; 71.15.Qe; Projection operator method; 79.60.−i; Metal–insulator transition; 71.30.+h; Many-body coherent potential approximation; 71.10.−w
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2003.12.699

A new projection operator method combined with the coherent potential approximation is presented. The theory interpolates between the strong- and the weak-Coulomb interaction limits, and allows us to calculate the momentum dependence of the self-energy. Numerical results for the case of infinite dimensions indicate that it can describe quantitatively the quasi-particle properties of a system.