Single-particle spectrum in the electron-doped cuprates |
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Authors: | Kusunose Hiroaki Rice T M |
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Institution: | Institut für Theoretische Physik, ETH-H?nggerberg, CH-8093 Zürich, Switzerland. |
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Abstract: | We study the evolution of the single-particle spectrum with electron doping in a scheme which adds multiple exchange of transverse spin excitations to the mean-field antiferromagnetic insulator. Away from half-filling small Fermi surface pockets appear first around the X points, and simultaneously new spectral weight grows in the insulating gap. With further doping the in-gap states develop the character of a renormalized quasiparticle band near the chemical potential. The essential features in momentum-energy space agree well with recent studies using angle-resolved photoemission spectroscopy on electron-doped cuprates. We interpret the origins and the nature of the in-gap states using a simple variational wave function. |
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