Anisotropic dressing of electrons in electron-doped cuprate superconductors

Abstract

Recent experiments revealed a remarkable possibility for the absence of the disparity between the phase diagrams of electron- and hole-doped cuprate superconductors, while such an aspect should also be reflected in the dressing of the electrons. Here the phase diagrams of electron-doped cuprate superconductors and the related exotic features of the anisotropic dressing of the electrons are studied based on kinetic-energy-driven superconductivity. It is shown that although the optimized Tc in the electron-doped side is much smaller than that in the hole-doped case, the electron- and hole-doped cuprate superconductors rather resemble each other in the doping range of the superconducting dome, indicating an absence of the disparity between the phase diagrams of electron- and hole-doped cuprate superconductors. In particular, the anisotropic dressing of the electrons due to strong electron coupling to strongly dispersive spin excitation leads to the truncation of the electron Fermi surface to form the disconnected Fermi arcs centered around the nodal region. Concomitantly, the dip in the peak-dip-hump structure of the quasiparticle excitation spectrum is directly associated with the corresponding peak in the quasiparticle scattering rate, while the dispersion kink is always accompanied by the corresponding inflection point in the total self-energy as the dip in the peak-dip-hump structure and the dispersion kink in the hole-doped counterparts. The theory also predicts that both normal and anomalous self-energies exhibit well-pronounced low-energy peak structures.

Source-reported materials — not catalogue approval

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