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Dynamical two electron states in a Hubbard-Davydov model

Author

Listed:
  • L. Cruzeiro
  • J. Eilbeck
  • J. Marín
  • F. Russell

Abstract

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. Copyright Springer-Verlag Berlin/Heidelberg 2004

Suggested Citation

  • L. Cruzeiro & J. Eilbeck & J. Marín & F. Russell, 2004. "Dynamical two electron states in a Hubbard-Davydov model," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 42(1), pages 95-102, November.
    • Handle: RePEc:spr:eurphb:v:42:y:2004:i:1:p:95-102
    DOI: 10.1140/epjb/e2004-00360-1
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