Article,

Evidence for an Energy Scale for Quasiparticle Dispersion in $Bi2Sr2CaCu2O8$

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Phys. Rev. Lett., 85 (12): 2581--2584 (September 2000)
DOI: 10.1103/PhysRevLett.85.2581

Abstract

Quasiparticle dispersion in Bi2Sr2CaCu2O8 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±15 meV binding energy where the velocity changes by a factor of 2 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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