Abstract
In the present photoemission study of a cuprate superconductor , we discovered a large scale dispersion of the lowest band, which unexpectedly follows the band structure calculation very well. Similar behavior observed in blue bronze and the Mott insulator suggests that the origin of hopping-dominated dispersion in an overdoped cuprate might be quite complicated. A giant kink in the dispersion is observed, and the complete self-energy containing all interaction information is extracted for a doped cuprate. These results recovered significant missing pieces in our current understanding of the electronic structure of cuprates.
- Received 21 May 2006
DOI:https://doi.org/10.1103/PhysRevLett.98.147001
©2007 American Physical Society