| We have analyzed an extensive set of angle-resolved photoemission (ARPES) intensity data as a function of binding energy from La2-xSrxCuO4 (LSCO) samples ranging in doping from the heavily underdoped case of x=0.01 to the heavily overdoped x=0.30 system. The observed dispersive features are analyzed with reference to the doping-dependent LDA-based band theory predictions. The results reveal not only that the observed Fermi surface maps are in excellent accord with the LDA calculations, but also that the agreement between theoretical and experimental gross band dispersions persists to quite high energy scales of several hundred meV's even in the highly underdoped Mott insulator regime. The presence of the three-dimensional VHS is found to be a universal property of LSCO, which can be clearly located in all samples up to x=0.22, at which point the bottom of the VHS rises above the Fermi level. Signatures of strong correlation physics are manifest however through {\em the suppression of spectral weight} near the Fermi energy particularly in the underdoped system. In this way, even though the gross dispersion is virtually unrenormalized, there is a strong renormalization of the spectral weight. Work supported in part by the USDOE. |
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