Anomalous dispersion in the autocorrelation of angle-resolved photoemission spectra of high-temperature Bi_2Sr_2CaCu_2O_8+δ superconductors
Fretwell, H. M.
Li, Z. Z.
Norman, M. R.
Campuzano, J. C.
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Publisher:American Physical Society
Citation:U. Chatterjee et al, "Anomalous dispersion in the autocorrelation of angle-resolved photoemission spectra of high-temperature Bi_2Sr_2CaCu_2O_8+δ superconductors," Physical Review B 76, no. 1 (2007), doi:10.1103/PhysRevB.76.012504
We find that peaks in the autocorrelation of angle-resolved photoemission spectroscopy data of Bi_2Sr_2CaCu_2O_8+δ in the superconducting state show dispersive behavior for binding energies smaller than the maximum superconducting energy gap. For higher energies, though, a striking anomalous dispersion is observed that is a consequence of the interaction of the electrons with collective excitations. In contrast, in the pseudogap phase, we only observe dispersionless behavior for the autocorrelation peaks. The implications of our findings in regard to Fourier transformed scanning tunneling spectroscopy data are discussed.
Rights:©2007 The American Physical Society
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