Polaronic effect in lightly doped high-Tc cuprates

The effect of in-plane oxygen phonons is investigated by numerical exact diagonalizations of the t-J Holstein model.[1] The present study indicates that the breathing vibration mode gives rise to a polaronic effect which yields a broadening of the single hole quasiparticle spectrum and a shift from the chemical potential, as the one observed in angle-resolved photoemission spectroscopy.[2] [1] T. Sakai, D.Poilblanc and D.J.Scalapino, Phys. Rev. B 55 (1997) 8445. [2] K. M. Shen et al., Phys. Rev. Lett. 93 (2004) 267002.