Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101956
Title: Effective Heisenberg Model and Exchange Interaction for Strongly Correlated Systems
Authors: Stepanov, E. A.
Brener, S.
Krien, F.
Harland, M.
Lichtenstein, A. I.
Katsnelson, M. I.
Issue Date: 2018
Publisher: American Physical Society
Citation: Effective Heisenberg Model and Exchange Interaction for Strongly Correlated Systems / E. A. Stepanov, S. Brener, F. Krien, et al. — DOI 10.1103/PhysRevLett.121.037204 // Physical Review Letters. — 2018. — Vol. 121. — Iss. 3. — 037204.
Abstract: We consider the extended Hubbard model and introduce a corresponding Heisenberg-like problem written in terms of spin operators. The derived formalism is reminiscent of Anderson's idea of the effective exchange interaction and takes into account nonlocal correlation effects. The results for the exchange interaction and spin susceptibility in the magnetic phase are expressed in terms of single-particle quantities. This fact not only can be used for realistic calculations of multiband systems but also allows us to reconsider a general description of many-body effects in the most interesting physical regimes, where the physical properties of the system are dominated by collective (bosonic) fluctuations. In the strongly spin-polarized limit, when the local magnetic moment is well defined, the exchange interaction reduces to a standard expression of the density functional theory that has been successfully used in practical calculations of magnetic properties of real materials. © 2018 American Physical Society.
Keywords: EXCHANGE INTERACTIONS
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
EFFECTIVE HEISENBERG MODEL
EXTENDED HUBBARD MODEL
GENERAL DESCRIPTION
LOCAL MAGNETIC MOMENTS
NONLOCAL CORRELATIONS
PRACTICAL CALCULATION
SPIN SUSCEPTIBILITY
STRONGLY CORRELATED SYSTEMS
DENSITY FUNCTIONAL THEORY
ARTICLE
DENSITY FUNCTIONAL THEORY
HUMAN
URI: http://hdl.handle.net/10995/101956
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85050394645
PURE ID: 7641338
d020a015-6d4e-4f0c-bf8e-a73b2f2fed53
ISSN: 319007
DOI: 10.1103/PhysRevLett.121.037204
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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