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Stability of the Spontaneous Quantum Hall State in the Triangular Kondo-Lattice Model

โœ Scribed by Kato, Yasuyuki; Martin, Ivar; Batista, C. D.

Book ID
121863886
Publisher
The American Physical Society
Year
2010
Tongue
English
Weight
432 KB
Volume
105
Category
Article
ISSN
0031-9007

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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 ร€y 2 and d +