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Phonon renormalization from local and transitive electron-lattice couplings in strongly correlated systems (Articolo in rivista)

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Phonon renormalization from local and transitive electron-lattice couplings in strongly correlated systems (Articolo in rivista) (literal)

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E. von Oelsen (1); A. Di Ciolo (2); J. Lorenzana (2,3); G. Seibold (1); M. Grilli (2) (2010)
Phonon renormalization from local and transitive electron-lattice couplings in strongly correlated systems
in Physical review. B, Condensed matter and materials physics
(literal)

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E. von Oelsen (1); A. Di Ciolo (2); J. Lorenzana (2,3); G. Seibold (1); M. Grilli (2) (literal)

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(1) Institut für Physik, BTU Cottbus, P.O. Box 101344, 03013 Cottbus, Germany (2) SMC-INFM-CNR, Dipartimento di Fisica, Università di Roma \"La Sapienza,\" P. Aldo Moro 2, 00185 Roma, Italy (3) ISC-CNR, Via dei Taurini 19, 00185 Roma, Italy (literal)

Titolo

Phonon renormalization from local and transitive electron-lattice couplings in strongly correlated systems (literal)

Abstract

Within the time-dependent Gutzwiller approximation applied to one-dimensional Holstein and Su-Schrieffer-Heeger-Hubbard models, we study the influence of electron correlations on the phonon self-energy. For the local Holstein coupling, we find that the phonon-frequency renormalization gets weakened upon increasing the on-site interaction U for all momenta. In contrast, correlations can enhance the phonon-frequency shift for small wave vectors in the Su-Schrieffer-Heeger-Hubbard model. Moreover, the time-dependent Gutzwiller approximation applied to the latter model provides a mechanism which leads to phonon-frequency corrections at intermediate momenta due to the coupling with double-occupancy fluctuations. Both models display a shift of the nesting induced to a q =0 instability when the on-site interaction becomes sufficiently strong and thus establishing phase separation as a generic phenomenon of strongly correlated electron-phonon coupled systems. (literal)

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