Self-consistent dual boson approach to single-particle and collective excitations in correlated systems
| Autor: | Alexander I. Lichtenstein, E. A. Stepanov, Andrey A. Katanin, E. G. C. P. van Loon, Mikhail I. Katsnelson, Alexey N. Rubtsov |
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| Rok vydání: | 2016 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Conservation law Strongly Correlated Electrons (cond-mat.str-el) Theory of Condensed Matter FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Dual (category theory) Renormalization Condensed Matter - Strongly Correlated Electrons Scheme (mathematics) Quantum mechanics 0103 physical sciences ComputingMethodologies_DOCUMENTANDTEXTPROCESSING Quasiparticle Particle 010306 general physics 0210 nano-technology Boson |
| Zdroj: | Physical Review B, 93, 16 Phys. Rev. B Physical Review B Physical Review B, 93, 4, pp. 16 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.93.045107 |
| Popis: | We propose an efficient dual boson scheme, which extends the DMFT 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. Comment: 17 pages, 12 figures |
| Databáze: | OpenAIRE |
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