High-energy kink in the single-particle spectra of cuprates

✍ Scribed by S. Cojocaru; R. Citro; M. Marinaro

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 169 KB
• Volume: 403
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2007.10.098

✦ Synopsis

Within a phenomenological model where electrons are coupled to a bosonic mode in a generic form of damped oscillator, we analyze the high-energy kink recently observed in ARPES experiments on cuprates. It is shown that the model allows to describe the main anomalous features found in experiments, such as the broad incoherent spectral weight, the ''waterfall dispersion'', its doping and temperature dependence. In contrast to the low-energy kink, presence of significant damping is required to account for the anomalies. The ''bosonic mode'' is related to the incoherent excitation peak observed in optical conductivity spectra of cuprates.