Quantum Monte Carlo Study of Random Antiferromagnetic Heisenberg Chain

Details Quantum Monte Carlo Study of Random Antiferromagnetic Heisenberg Chain Quantum Monte Carlo Study of Random Antiferromagnetic Heisenberg Chain

1998-03-09

arxiv.org/abs/cond-mat/9803088v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 2 EPS figures; to be published in "Computer Simulation Studies in Condensed Matter Physics XI," Eds. D. P. Landau and

Scientific paper

Effects of randomness on the spin-1/2 and 1 antiferromagnetic Heisenberg chains are studied using the quantum Monte Carlo method with the continuous-time loop algorithm. We precisely calculated the uniform susceptibility, string order parameter, spatial and temporal correlation length, and the dynamical exponent, and obtained a phase diagram. The generalization of the continuous-time loop algorithm for the systems with higher-S spins is also presented.

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