arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0909.0121cond-mat.stat-mech
收藏

三角格子Heisenberg反铁磁体的Z_2涡旋序

Z_2-vortex ordering of the triangular-lattice Heisenberg antiferromagnet

Hikaru Kawamura, Atsushi Yamamoto, Tsuyoshi Okubo

摘要:

本文用平均场计算、标度论证和蒙特卡罗模拟研究了三角晶格上经典海森堡反铁磁体的有序化,并特别注意了它的涡旋自由度。该模型表现出由Z_2涡束缚-解束缚驱动的热力学相变,在此相变点上,各种热力学量表现出本质奇异性。低温态是一种自旋相关长度较长但有限的“自旋凝胶”态,其中遍历性在拓扑上被打破。三角晶格海森堡反铁磁体最近的实验的影响进行了讨论。

英文摘要:

Ordering of the classical Heisenberg antiferromagnet on the triangular lattice is studied by means of a mean-field calculation, a scaling argument and a Monte Carlo simulation, with special attention to its vortex degree of freedom. The model exhibits a thermodynamic transition driven by the Z_2-vortex binding-unbinding, at which various thermodynamic quantities exhibit an essential singularity. The low-temperature state is a "spin-gel" state with a long but finite spin correlation length where the ergodicity is broken topologically. Implications to recent experiments on triangular-lattice Heisenberg antiferromagnets are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑