In: Journal of Superconductivity and Novel Magnetism, 2011, vol. 24, no. 3, p. 1157-1159
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In: Journal of Superconductivity and Novel Magnetism, 2011, vol. 24, no. 3, p. 1157-1159
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...
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In: Physical Review B, 2009, vol. 79, no. 10, p. 100510(R)
An elaborate variational wave function is used for studying superconductivity in the (repulsive) two-dimensional Hubbard model, including both nearest- and next-nearest-neighbor hoppings. A marked asymmetry is found between the “localized” hole-doped region and the more itinerant electron-doped region. Superconductivity with d-wave symmetry turns out to be restricted to densities where...
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