期刊
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
卷 -, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1742-5468/2009/03/P03021
关键词
quantum Monte Carlo simulations
资金
- CONACYT [50744-F]
- Proyecto Cuerpo-Academico-56-UCOL
- Schweizerischer Nationalfonds (SNF)
- Schweizerische Universitatskonferenz (SUK/CRUS)
We employ an improved estimator to calculate the constraint effective potential of the staggered magnetization in the spin 1 2 quantum Heisenberg model using a loop-cluster algorithm. The first and second moment of the probability distribution of the staggered magnetization are in excellent agreement with the predictions from the systematic low-energy magnon effective field theory. We also compare the Monte Carlo data with the universal shape of the constraint effective potential of the staggered magnetization and study its approach to the convex effective potential in the infinite volume limit. In this way the higher-order low-energy parameter k(0) is determined from a fit to the numerical data.
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