title: Temperature and doping dependence of the high-energy kink in cuprates.
abstract: 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.
authors.affiliation: J. Stefan Institute, SI-1000 Ljubljana, Slovenia.
authors.forename: M M
authors.initials: MM
authors.lastname: Zemljic
authors.forename: P
authors.initials: P
authors.lastname: Prelovsek
authors.forename: T
authors.initials: T
authors.lastname: Tohyama