Abstract
Recent angular resolved photoemission spectroscopy (ARPES) measurements on electron-doped cuprate Nd 2 - x Ce x CuO 4 have revealed the intriguing Fermi surface (FS) evolution with doping. By analyzing the ARPES data, I and collaborators proposed the view that the FS pocket around ( π / 2 , π / 2 ) has not yet formed until doping reaches the optimal value x = 0.15 . Therefore in the underdoped regime, even if the superconducting pairing order parameter is d-wave which vanishes along the diagonal line, the quasiparticle excitation has a finite, i.e., s-wave-like gap due to the absence of the FS across that line. In this paper, I further describe the whole picture for the FS evolution from underdoping to overdoping and the associated property variation from nodeless to nodal d-wave superconductivity. The local density of states is newly calculated for STM measurements.
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