Electron-phonon interaction in the t-J model

Details Electron-phonon interaction in the t-J model Electron-phonon interaction in the t-J model

2003-08-03

arxiv.org/abs/cond-mat/0308035v2

Phys. Rev. Lett. 92, 146403 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTeX, 3 eps figures; final version with minor corrections

Scientific paper

10.1103/PhysRevLett.92.146403

We derive a t-J model with electron-phonon coupling from the three-band model, considering modulation of both hopping and Coulomb integrals by phonons. While the modulation of the hopping integrals dominates, the modulation of the Coulomb integrals cannot be neglected. The model explains the experimentally observed anomalous softening of the half-breathing mode upon doping and a weaker softening of the breathing mode. It is shown that other phonons are not strongly influenced, and, in particular, the coupling to a buckling mode is not strong in this model.

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