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Variational Monte-Carlo Study of Superconductivity and Magnetism in the Two-Dimensional Hubbard Model
Abstract We use a variational Monte-Carlo technique to study the ground-state of the two dimensional Hubbard model on a square lattice. We introduce a trial wave-function which allows a continuous description of the paramagnetic, antiferromagnetic and superconducting phases, as well as the coexistence of these phases, with no a priori constraint on double occupancy. The phase diagram is given for intermediate coupling (U = 10t). We find that except at half-filling a pure antiferromagnetic phase does not exist but is always in coexistence with a d-wave superconducting phase, for doping less than δ ~ 0.2. A pure d-wave superconducting phase extends to dopings as large as δ ~ 0.3. The staggered magnetization and the superconducting gap are measured, and a comparison with other analytical or numerical results is made.
Variational Monte-Carlo Study of Superconductivity and Magnetism in the Two-Dimensional Hubbard Model
Abstract We use a variational Monte-Carlo technique to study the ground-state of the two dimensional Hubbard model on a square lattice. We introduce a trial wave-function which allows a continuous description of the paramagnetic, antiferromagnetic and superconducting phases, as well as the coexistence of these phases, with no a priori constraint on double occupancy. The phase diagram is given for intermediate coupling (U = 10t). We find that except at half-filling a pure antiferromagnetic phase does not exist but is always in coexistence with a d-wave superconducting phase, for doping less than δ ~ 0.2. A pure d-wave superconducting phase extends to dopings as large as δ ~ 0.3. The staggered magnetization and the superconducting gap are measured, and a comparison with other analytical or numerical results is made.
Variational Monte-Carlo Study of Superconductivity and Magnetism in the Two-Dimensional Hubbard Model
Giamarchi, T. (author) / Lhuillier, C. (author)
Condensed Matter Theories ; 163-172
1990-01-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
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