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Evidence of Electron Fractionalization from Photoemission Spectra in the High Temperature Superconductors
Physical Review Letters
In the normal state of the high temperature superconductors Bi_2Sr_2CaCu_2O_8+delta and La_2-xSr_xCuO_4, and in the related "stripe ordered" material La_1.25Nd_0.6Sr_0.15CuO_4, there is sharp structure in the measured single hole spectral function A(k,w) considered as a function of k at fixed small binding energy w. At the same time, as a function of w at fixed k on much of the putative Fermi surface, any structure in A(k,w), other than the Fermi cutoff, is very broad. This is characteristic ofdoi:10.1103/physrevlett.86.4362 pmid:11328175 fatcat:lho4wy5uevfx7marbryl56oa34