Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-31
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures
Scientific paper
An algorithm to find a graded Projected Entangled-Pair State representation of the ground state wave functions is developed for translationally invariant strongly correlated electronic systems on infinite-size lattices in two spatial dimensions. It is tested for the two-dimensional t-J model at and away from half filling, with truncation dimensions up to 6. We are able to locate a line of phase separation, which qualitatively agrees with the results based on the high-temperature expansions. We find that the model exhibits an extended s-wave superconductivity for J=0.4t at quarter filling. However, we emphasize that the currently accessible truncation dimensions are not large enough, so it is necessary to incorporate the symmetry of the system into the algorithm, in order to achieve results with higher precision.
Li Sheng-Hao
Shi Qian-Qian
Zhao Jian-Hui
Zhou Huan-Qiang
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