Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-10-29
Physics
Condensed Matter
Strongly Correlated Electrons
Proc. Int. Conference on Quantum Phenomena in Complex Matter, Erice, July 19-25, 2010, to appear in Journal of Superconductivi
Scientific paper
The two-dimensional repulsive Hubbard model has been investigated by a variety of methods, from small to large U. Superconductivity with d-wave symmetry is consistently found close to half filling. After a brief review of the various methods a variational many-electron state is discussed in more detail. This trial state is a natural extension of the Gutzwiller ansatz and provides a substantial improvement thereof.
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