High-precision determination of low-energy effective parameters for a two-dimensional Heisenberg quantum antiferromagnet

F. J. Jiang*, U. J. Wiese

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

27 引文 斯高帕斯(Scopus)

摘要

The two-dimensional (2D) spin-12 Heisenberg antiferromagnet with exchange coupling J is investigated on a periodic square lattice of spacing a at very small temperatures using the loop-cluster algorithm. Monte Carlo data for the staggered and uniform susceptibilities are compared with analytic results obtained in the systematic low-energy effective field theory for the staggered magnetization order parameter. The low-energy parameters of the effective theory, i.e., the staggered magnetization density Ms=0.307 43(1)/a2, the spin stiffness ρs=0.180 81(11)J, and the spin wave velocity c=1.6586(3)Ja, are determined with very high precision. Our study may serve as a test case for the comparison of lattice quantum chromodynamics Monte Carlo data with analytic predictions of the chiral effective theory for pions and nucleons, which is vital for the quantitative understanding of the strong interaction at low energies.

原文英語
文章編號155120
期刊Physical Review B - Condensed Matter and Materials Physics
83
發行號15
DOIs
出版狀態已發佈 - 2011 四月 26

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學

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