MULTIMODE ELECTRON-PHONON COUPLING IN THE 2-DIMENSIONAL T-J-HOLSTEIN MODEL

Polaronic effects are investigated in the two-dimensional t-J model (d escribing Cu spins and holes of the planes in high-T-c cuprates) in th e presence of in-plane dynamic oxygen breathing modes. We focus on the effect of dynamic multi-phonon modes. Spin and charge structure facto rs are computed. We found evidence for self-localization of the holes and increased short-range antiferromagnetic spin-spin correlations bet ween the remaining spins. This effect persists when all the in-plane o xygen vibration degrees of freedom are taken into account. This sugges ts that dynamic phonons could play a key role in stabilizing inhomogen eous stripe phases or domain wall structures.