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

doi:10.1103/PhysRevLett.85.2581

Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8

Condensed Matter 2009-10-31 v1

Authors: 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.

Keywords

quasiparticle dispersion energy scale binding energy d-wave node self-energy

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@article{arxiv.cond-mat/0004349,
  title  = {Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8},
  author = {P. V. Bogdanov and A. Lanzara and S. A. Kellar and X. J. Zhou and E. D. Lu and W. Zheng and G. Gu and K. Kishio and J. -I. Shimoyama and Z. Hussain and Z. X. Shen},
  journal= {arXiv preprint arXiv:cond-mat/0004349},
  year   = {2009}
}

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Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8

Abstract

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