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Title: Self-consistent dual boson approach to single-particle and collective excitations in correlated systems
Authors: Stepanov, E. A.
Van, Loon, E. G. C. P.
Katanin, A. A.
Lichtenstein, A. I.
Katsnelson, M. I.
Rubtsov, A. N.
Issue Date: 2016
Publisher: American Physical Society
Citation: Self-consistent dual boson approach to single-particle and collective excitations in correlated systems / E. A. Stepanov, E. G. C. P. Van Loon, A. A. Katanin, et al. — DOI 10.1103/PhysRevB.93.045107 // Physical Review B. — 2016. — Vol. 93. — Iss. 4. — 045107.
Abstract: We propose an efficient dual boson scheme, which extends the dynamical mean-field theory paradigm to collective excitations in correlated systems. The theory is fully self-consistent both on the one- and on the two-particle level, thus describing the formation of collective modes as well as the renormalization of electronic and bosonic spectra on equal footing. The method employs an effective impurity model comprising both fermionic and bosonic hybridization functions. Only single- and two-electron Green's functions of the reference problem enter the theory, due to the optimal choice of the self-consistency condition for the effective bosonic bath. We show that the theory is naturally described by a dual Luttinger-Ward functional and obeys the relevant conservation laws. © 2016 American Physical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84955441930
PURE ID: 657425
ISSN: 24699950
DOI: 10.1103/PhysRevB.93.045107
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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