The two-particle propagator and magnetic susceptibility in the Hubbard model

Autor:	R. J. Elliott, A. Uldry
Rok vydání:	2005
Předmět:	Physics Hubbard model Scattering Magnetism Propagator Condensed Matter Physics Magnetic susceptibility Vertex (geometry) Condensed Matter::Materials Science Stoner criterion Spin wave Quantum electrodynamics Condensed Matter::Strongly Correlated Electrons General Materials Science
Zdroj:	Journal of Physics: Condensed Matter. 17:2903-2917
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/17/19/007
Popis:	We treat the two-particle Green's function in the Hubbard model using the recently developed tau-CPA, a hybrid treatment that applies the coherent-potential approximation (CPA) up to a time tau related to the inverse of the band width, after which the system is averaged using the virtual-crystal approximation (VCA). This model, with suitable approximations, does predict magnetism for a modified Stoner criterion. The evaluation of the two-particle propagator in the tau-CPA requires the solution of the pure CPA, within whose formalism the vertex correction and the weighted Green's functions are obtained. The dynamical susceptibility, including the vertex correction and the weighted scattering by the residual interaction, is calculated and shows a spin wave spectrum in the ferromagnetic regime.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::241c8bb6057b448b125942097b3978de https://doi.org/10.1088/0953-8984/17/19/007 Zobrazit plný text záznamu