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High-energy scale revival and giant kink in the dispersion of a cuprate superconductor

B. P. Xie·K. Yang·D. W. Shen·J. F. Zhao·H. W. Ou·J. Wei·S. Y. Gu·M. Arita·S. Qiao·H. Namatame·M. Taniguchi·N. Kaneko·H. Eisaki·Z. Q. Yang·D. L. Feng
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Abstract

In the present photoemission study of a cuprate superconductor Bi1.74Pb0.38Sr1.88CuO6+delta, we discovered a large scale dispersion of the lowest band, which unexpectedly follows the band structure calculation very well. The incoherent nature of the spectra suggests that the hopping-dominated dispersion occurs possibly with the assistance of local spin correlations. A giant kink in the dispersion is observed, and the complete self-energy containing all interaction information is extracted for a doped cuprate in the low energy region. These results recovered significant missing pieces in our current understanding of the electronic structure of cuprates.

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B. P. Xie, K. Yang, D. W. Shen, J. F. Zhao, H. W. Ou, J. Wei, S. Y. Gu, M. Arita, S. Qiao, H. Namatame, M. Taniguchi, N. Kaneko, H. Eisaki, Z. Q. Yang, D. L. Feng. 2006-07-18. High-energy scale revival and giant kink in the dispersion of a cuprate superconductor. https://doi.org/10.1103/physrevlett.98.147001

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