Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101788
Title: Effective Ising model for correlated systems with charge ordering
Authors: Stepanov, E. A.
Huber, A.
Lichtenstein, A. I.
Katsnelson, M. I.
Issue Date: 2019
Publisher: American Physical Society
Citation: Effective Ising model for correlated systems with charge ordering / E. A. Stepanov, A. Huber, A. I. Lichtenstein, et al. — DOI 10.1103/PhysRevB.99.115124 // Physical Review B. — 2019. — Vol. 99. — Iss. 11. — 115124.
Abstract: Collective electronic fluctuations in correlated materials give rise to various important phenomena, such as charge ordering, superconductivity, Mott insulating and magnetic phases, and plasmon and magnon modes. Unfortunately, the description of these correlation effects requires significant effort, since they almost entirely rely on strong local and nonlocal electron-electron interactions. Some collective phenomena, such as magnetism, can be sufficiently described by simple Heisenberg-like models that are formulated in terms of bosonic variables. This fact suggests that other many-body excitations can also be described by simple bosonic models in the spirit of Heisenberg theory. Here we derive an effective bosonic action for charge degrees of freedom for the extended Hubbard model and define a physical regime where the obtained action reduces to a classical Hamiltonian of an effective Ising model. © 2019 American Physical Society.
Keywords: DEGREES OF FREEDOM (MECHANICS)
ELECTRON-ELECTRON INTERACTIONS
ISING MODEL
CHARGE ORDERING
COLLECTIVE PHENOMENA
CORRELATED MATERIALS
CORRELATED SYSTEMS
CORRELATION EFFECT
EXTENDED HUBBARD MODEL
MAGNETIC PHASIS
MAGNON MODES
BOSONS
URI: http://hdl.handle.net/10995/101788
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85063267301
PURE ID: 9179048
69396954-ec92-4793-a8b8-88c68a67369b
ISSN: 24699950
DOI: 10.1103/PhysRevB.99.115124
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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