Abstract
The angle-resolved photoemission spectroscopy provides unique information for the dramatic change of high-Tc cuprates from insulator to superconductor upon carrier-doping. To extract the underlying physics, we investigate the single-particle spectral function of the extended t- J model with long-range hopping terms. In undoped system, a broad spectrum at k=(π,0) is found to be due to a novel spin liquid state around a photo-doped hole, accompanied by the separation of the spin and charge degree of freedom. With doping, the (π,0) spectrum is systematically evolved from broad line shape in underdoped system to sharp one in overdoped system. We argue that the broadness in the underdoped system is an indication of the spin liquid state.
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