Correlation-functions of the Hubbard-model At Low-density In A Crossing-symmetrical Approximation - Comparisons With Monte-carlo Simulations
| Titre | Correlation-functions of the Hubbard-model At Low-density In A Crossing-symmetrical Approximation - Comparisons With Monte-carlo Simulations |
| Type de publication | Journal Article |
| Nouvelles publications | 1994 |
| Auteurs | Daré AM, Chen L, Tremblay A-MS |
| Journal | Physica B |
| Volume | 194 |
| Pagination | 1413–1414 |
| Résumé | The accuracy of a simple crossing-symmetric approximation for the fully reducible vertex is tested by comparisons of the spin, charge, and pairing correlations with those obtained by Monte Carlo simulations of the two-dimensional Hubbard model. The approximation under study consists in assuming that for parallel spins the fully reducible vertex vanishes, while for anti-parallel spins it is equal to the T-matrix. Up to quarter-filling, accuracies better than 10% are obtained. |
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