A quantum Monte Carlo algorithm for the transverse Ising model with arbitrary short- or long-range interactions is presented. The algorithm is based on sampling the diagonal matrix elements of the power-series expansion of the density matrix (stochastic series expansion), and avoids the interaction summations necessary in conventional methods. In the case of long-range interactions, the scaling of the computation time with the system size N is therefore reduced from N2 to N ln(N). The method is tested on a one-dimensional ferromagnet in a transverse field, with interactions decaying as 1/r(2).
Stochastic series expansion method for quantum Ising models with arbitrary interactions.
Published 2003 in Physical review. E, Statistical, nonlinear, and soft matter physics
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- Publication year
2003
- Venue
Physical review. E, Statistical, nonlinear, and soft matter physics
- Publication date
2003-03-28
- Fields of study
Medicine, Physics, Mathematics
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Semantic Scholar, PubMed
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