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Evolution of the spectrum and the metal-insulator transition in local approximations for many-electron models
A. O. Anokhin, A. V. Zarubin, V. Yu. Irkhin
In the framework of the many-electron s-d exchange model and Hubbard model, self-consistent equations are derived for the one-particle retarded Green's function in the many-electro…
The Kondo effect in the presence of Van Hove singularities: A numerical renormalization group study
A. K. Zhuravlev, V. Yu. Irkhin
A numerical renormalization group (NRG) investigation of the one-centre Kondo problem is performed for the square lattice with account of logarithmic Van Hove singularities…
Ferromagnetism, spiral magnetic structures and phase separation in the two-dimensional Hubbard model
P. A. Igoshev, A. V. Zarubin, A. A. Katanin +1
The quasistatic approximation and equation-of-motion decoupling for the electron Green's functions are applied to trace the effect of electronic dispersion and electron correlation…
A Modern Model Description of Magnetism
V. Yu. Irkhin
A comparison is given of the fundamental works of S. V. Vonsovsky on the many-electron polar and s-d(f) exchange models with the subsequent development of the theory of magnetism o…
Ferromagnetic instability and finite-temperature properties of two-dimensional electron systems with van Hove singularities
A. A. Katanin, H. Yamase, V. Yu. Irkhin
We study a ferromagnetic tendency in the two-dimensional Hubbard model near van Hove filling by using a functional renormalization-group method. We compute temperature dependences…