Superconducting ground state of the two-dimensional Hubbard model: A variational study

✍ Scribed by David Eichenberger; Dionys Baeriswyl

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 109 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.366

✦ Synopsis

A trial wave function is proposed for studying the instability of the two-dimensional Hubbard model with respect to d-wave superconductivity. Double occupancy is reduced in a similar way as in previous variational studies, but in addition our wave function both enhances the delocalization of holes and induces a kinetic exchange between the electron spins. These refinements lead to a large energy gain, while the pairing appears to be weakly affected by the additional term in the variational wave function.