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Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8

P. V. Bogdanov·A. Lanzara·S. A. Kellar·X. J. Zhou·E. D. Lu·W. Zheng·G. Gu·K. Kishio·J. -I. Shimoyama·Z. Hussain·Z. X. Shen
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Abstract

Quasiparticle dispersion in $Bi_{2}Sr_{2}CaCu_{2}O_{8}$ is investigated with improved angular resolution as a function of temperature and doping. Unlike the linear dispersion predicted by the band calculation, the data show a sharp break in dispersion at $50\pm10$ $meV$ binding energy where the velocity changes by a factor of two or more. This change provides an energy scale in the quasiparticle self-energy. This break in dispersion is evident at and away from the d-wave node line, but the magnitude of the dispersion change decreases with temperature and with increasing doping.

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P. V. Bogdanov, A. Lanzara, S. A. Kellar, X. J. Zhou, E. D. Lu, W. Zheng, G. Gu, K. Kishio, J. -I. Shimoyama, Z. Hussain, Z. X. Shen. 2000-04-20. Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8. https://doi.org/10.1103/physrevlett.85.2581

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