Meron-Cluster Simulation of Quantum Spin Ladders in a Magnetic Field

Details Meron-Cluster Simulation of Quantum Spin Ladders in a Magnetic Field Meron-Cluster Simulation of Quantum Spin Ladders in a Magnetic Field

1999-09-30

arxiv.org/abs/cond-mat/9909451v1

Physics

Condensed Matter

Statistical Mechanics

23 pages, 5 figures

Scientific paper

Numerical simulations of numerous quantum systems suffer from the notorious sign problem. Meron-cluster algorithms lead to an efficient solution of sign problems for both fermionic and bosonic models. Here we apply the meron concept to quantum spin systems in an arbitrary external magnetic field, in which case standard cluster algorithms fail. As an example, we simulate antiferromagnetic quantum spin ladders in a uniform external magnetic field that competes with the spin-spin interaction. The numerical results are in agreement with analytic predictions for the magnetization as a function of the external field.

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