Abstract
We present high resolution angle resolved photoemission data of the bilayer superconductor (Bi2212) showing a clear doubling of the near bands. This splitting approaches zero along the nodal line and is not observed in single layer (Bi2201), indicating that the splitting is due to the long sought after bilayer splitting effect. The splitting has a magnitude of approximately 75 meV near the middle of the zone, extrapolating to about 110 meV near the point. The existence of these two bands also helps to clear up the recent controversy concerning the topology of the Fermi surface.
- Received 21 February 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.117002
©2001 American Physical Society