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High-energy anomaly and self-energy effects in ARPES spectra of cuprates

S. COJOCARU1,* , R. CITRO2, M. MARINARO2

Affiliation

  1. National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
  2. Dipartimento di Fisica \E.R. Caianiello" Università degli Studi di Salerno, I-84081 Baronissi (SA), Italy

Abstract

We analyze the high-energy anomaly recently observed in ARPES experiments on cuprates within a phenomenological model where electrons are coupled to a bosonic mode in a generic form of a damped oscillator. 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 mid-infrared excitation peak observed in optical conductivity spectra of cuprates..

Keywords

Cuprate, High – energy anomaly, ARPES spectra.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

S. COJOCARU, R. CITRO, M. MARINARO, High-energy anomaly and self-energy effects in ARPES spectra of cuprates, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1651-1654 (2008)