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On the ground state structure of the two-dimensional Hubbard model on a square lattice. Quantum melting of the Néel ordering

✍ Scribed by O.P. Sushkov

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
500 KB
Volume
162
Category
Article
ISSN
0375-9601

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As a model of the novel superconductor Na x CoO 2 AE yH 2 O, we study a triangular Hubbard model with doubly degenerate atomic orbitals, using an optimization variational Monte Carlo method. It is found that when the isolated Fermi surface overlaps the van Hove singularity points, d x 2 Ày 2 and d +