Dynamical two electron states in a Hubbard-Davydov model

L. Cruzeiro, J. C. Eilbeck, J. L. Marín, F. M. Russell

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


We study a model in which a Hubbard Hamiltonian is coupled to the dispersive phonons in a classical nonlinear lattice. Our calculations are restricted to the case where we have only two quasi-particles of opposite spins, and we investigate the dynamics when the second quasi-particle is added to a state corresponding to a minimal energy single quasi-particle state. Depending on the parameter values, we find a number of interesting regimes. In many of these, discrete breathers (DBs) play a prominent role with a localized lattice mode coupled to the quasiparticles. Simulations with a purely harmonic lattice show much weaker localization effects. Our results support the possibility that DBs are important in HTSC.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalEuropean Physical Journal B: Condensed Matter and Complex Systems
Issue number1
Publication statusPublished - Nov 2004


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