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Angle resolved photoelectron spectroscopic measurements have been performedon an insulating cuprate Ca_2CuO_2Cl_2. High resolution data taken along the\Gamma to (pi,pi) cut show an additional dispersive feature that merges withthe known dispersion of the lowest binding energy feature, which follows theusual strongly renormalized dispersion of ~0.35 eV. This higher energy partreveals a dispersion that is very close to the unrenormalized band predicted byband theory. A transfer of spectral weight from the low energy feature to thehigh energy feature is observed as the \Gamma point is approached. By comparingwith theoretical calculations the high energy feature observed heredemonstrates that the incoherent portion of the spectral function hassignificant structure in momentum space due to the presence of various energyscales.Comment: 5 pages, 3 figure

physical review. b, condensed matter and materials physics

Anomalous high-energy dispersion in angle-resolved photoemission spectra from the insulating cuprate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Ca</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Anomalous high-energy dispersion in angle-resolved photoemission spectra from the insulating cuprateCa2CuO2Cl2