Variational Monte-Carlo Studies of Superconductivity in Strongly Correlated Electron Systems
Hisatoshi Yokoyama, Hiroyuki Shiba
A variational Monte-Carlo method is formulated to study superconductivity in strongly correlated electrons. An application is made to the strongly correlated Hubbard model on two-dimensional square lattice, by employing the simplest mean-field-type trial wave function, i.e. the Gutzwiller-projected BCS wave function. Among the various choices examined, the d-wave-type superconductivity turns out to be the most favorable. The nature of the superconducting order parameter and spin correlations is also examined.
Journal of the Physical Society of Japan•Jul 15, 1988•207 citations