1206.3427 (G. Mazza et al.)

Kinks and waterfalls as signatures of competing order in angle-resolved
photoemission spectra of La_{2-x}Sr_xCuO_4    [PDF]

G. Mazza, M. Grilli, C. Di Castro, S. Caprara

We show that the so-called kinks and waterfalls observed in angle-resolved photoemission spectra of La2-xSrxCuO4, a prototypical high-Tc superconducting cuprate, result from the coupling of quasiparticles with two distinct nearly critical collective modes with finite characteristic wave vectors, typical of charge and spin fluctuations near a stripe instability. Both phonon-like charge and spin collective modes are needed to account for the kinked quasiparticle dispersions. This clarifies the long-standing question whether kinks are due to phonons or spin waves and the nature of the bosonic mediators of the electron-electron effective interaction in La2-xSrxCuO4.

View original: http://arxiv.org/abs/1206.3427