Quantum Monte Carlo simulations of infinitely strongly correlated fermions

Details Quantum Monte Carlo simulations of infinitely strongly correlated fermions Quantum Monte Carlo simulations of infinitely strongly correlated fermions

1997-07-10

arxiv.org/abs/cond-mat/9707108v1

Phys. Rev. B 58, R10100 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.58.R10100

Numerical simulations of the two-dimensional t-J model in the limit $J/t \ll 1$ are performed for rather large systems (up to $N = 12 \times 12$) using a world-line loop-algorithm. It is shown that in the one-hole case with J=0, where no minus signs appear, very low temperatures ($\beta t \sim 3000$) are necessary in order to reach Nagaoka's state. $J/t \ltsim 0.05$ leads to the formation of partially polarized systems, whereas $J/t \gtsim 0.05 $ corresponds to minimal spin. The two-hole case shows enhanced total spin up to the lowest attainable temperatures ($\beta t = 150$).

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