Europhys. Lett, 34 (5), pp. 367-372 (1996)
Multimode electron-phonon coupling in the two-dimensional t-J--Holstein model
D. Poilblanc , T. Sakai , D. J. Scalapino and W. Hanke
Laboratoire de Physique Quantique, Université Paul Sabatier,
31062 Toulouse, France
Department of Physics, University of California Santa Barbara, CA 93106, USA
Institute for Physics, University of Wurzburg, D-8700 Wurzburg, Germany
(received 12 February 1996; accepted 21 March 1996)
PACS. 71.27+a - Strongly correlated electron systems.
PACS. 71.38+i - Polarons and electron-phonon interactions.
PACS. 74.20Mn - Microscopic theory of high- superconductivity; insulator-superconductor transitions.
Abstract:Polaronic effects are investigated in the two-dimensional t-J model (describing Cu spins and holes of the planes in high- cuprates) in the presence of in-plane dynamic oxygen breathing modes. We focus on the effect of dynamic multi-phonon modes. Spin and charge structure factors are computed. We found evidence for self-localization of the holes and increased short-range antiferromagnetic spin-spin correlations between the remaining spins. This effect persists when all the in-plane oxygen vibration degrees of freedom are taken into account. This suggests that dynamic phonons could play a key role in stabilizing inhomogeneous stripe phases or domain wall structures.
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