Faculté des sciences

Superconductivity in the two-dimensional Hubbard model ?

Baeriswyl, Dionys ; Eichenberger, David ; Gut, Bruno

In: Physica Status Solidi b, 2007, vol. 244, no. 7, p. 2299 - 2303

A refined variational wave function for the two-dimensional repulsive Hubbard model is studied numerically, with the aim of approaching the difficult crossover regime of intermediate values of U. The issue of a superconducting ground state with d-wave symmetry is investigated for an average electron density n≈ 0.8 and for U = 8t. Due to finite-size effects a... Plus

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    Summary
    A refined variational wave function for the two-dimensional repulsive Hubbard model is studied numerically, with the aim of approaching the difficult crossover regime of intermediate values of U. The issue of a superconducting ground state with d-wave symmetry is investigated for an average electron density n≈ 0.8 and for U = 8t. Due to finite-size effects a clear-cut answer to this fundamental question has not yet been reached.