Abstract
Laser-based angle-resolved photoemission spectroscopy measurements have been carried out on the high energy electron dynamics in high temperature superconductor. Our superhigh resolution data, momentum-dependent measurements, and complete analysis provide important information to judge the nature of the high energy dispersion and kink. Our results rule out the possibility that the high energy dispersion from the momentum distribution curve (MDC) may represent the true bare band as believed in previous studies. We also rule out the possibility that the high energy kink represents electron coupling with some high energy modes as proposed before. Through detailed MDC and energy distribution curve analyses, we propose that the high energy MDC dispersion may not represent intrinsic band structure.
- Received 17 January 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.017002
©2008 American Physical Society