Nature of the Electronic Excitations near the Brillouin Zone Boundary of Bi2Sr2CaCu2O8+δ
Abstract
Based on angle resolved photoemission spectra measured on different systems at different dopings, momenta and photon energies, we show that the anomalously large spectral linewidth in the (π,0) region of optimal doped and underdoped Bi2Sr2CaCu2O8+δ has significant contributions from the bilayer splitting, and that the scattering rate in this region is considerably smaller than previously estimated. This new picture of the electronic excitation near (π,0) puts additional experimental constraints on various microscopic theories and data analysis.
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