Multimode electron-phonon coupling in the two-dimensional t-J–Holstein model

¹ Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse, France
² Department of Physics, University of California Santa Barbara, CA 93106, USA
³ Institute for Physics, University of Wurzburg, D-8700 Wurzburg, Germany

Received: 12 February 1996
Accepted: 21 March 1996

Abstract

Polaronic effects are investigated in the two-dimensional model (describing Cu spins and holes of the planes in high-T_c 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.