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Phys Rev Lett. 2008 Jan 25;100(3):036402. Epub 2008 Jan 24.

Temperature and doping dependence of the high-energy kink in cuprates.

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J. Stefan Institute, SI-1000 Ljubljana, Slovenia.


It is shown that spectral functions within the extended t-J model, evaluated using the finite-temperature diagonalization of small clusters, exhibit the high-energy kink in single-particle dispersion consistent with recent angle-resolved photoemission results on hole-doped cuprates. The kink and waterfall-like features persist up to large doping and to temperatures beyond J; hence, the origin can be generally attributed to strong correlations and incoherent hole propagation at large binding energies. In contrast, our analysis predicts that electron-doped cuprates do not exhibit these phenomena in photoemission.

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