SIGNATURE OF THE CUO2 PLANE RELATED BANDS IN YBA2CU3O6.9 AS SEEN BY ANGLE-RESOLVED PHOTOEMISSION

The intensity and polarization dependence of the spectral feature in angle-resolved photoemission (ARPES) associated with the CuO2 plane bands from the YBa2Cu3O7 (001 ) surface is computed for the first time within the band theory framework, and the corresponding polarization-dependent ARPES measurements are presented. The theoretical predictions are in remarkable agreement with the experimental features along the GAMMA-S line which have been interpreted as the signature Of CuO2 plane bands crossing the Fermi energy. Our results clearly establish that the bulk CuO2 plane bands are indeed observed by ARPES, and indicate that the local-density-approximation based wave functions implicit in the band theory reasonably describe the physical situation.