A fully fermionic mean field theory of the cuprate superconductors

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  • 28 October 2004
Abstract
We introduce a new mean field approach to the extended tJ model that incorporates both electron-like quasiparticles and spin-charge separated excitations as suggested by experiments and numerical studies. It leads to a mean field phase diagram which is consistent with that of hole and electron doped cuprates. Moreover, it provides a framework to describe the observed evolution of the electron spectral function from the undoped insulator to the overdoped Fermi metal for both hole and electron doping. The theory also provides a non-BCS mechanism leading to superconductivity.

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