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arXiv 1004.4730cond-mat.stat-mechcond-mat.str-el
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三角格子Heisenberg反铁磁体动力学关联中的Z_2涡旋

Signature of a Z_2 vortex in the dynamical correlations of the triangular-lattice Heisenberg antiferromagnet

Tsuyoshi Okubo, Hikaru Kawamura

摘要:

通过自旋动力学模拟和解析计算,研究了三角晶格上经典海森堡反铁磁体的动力学性质。虽然该模型被认为表现出由Z_2涡束缚-解束缚驱动的拓扑转变,但相关的热力学奇异性的弱点使得迄今为止很难在实验上观察到Z_2涡的证据,只有一些间接的支持。在这里,我们表明,签名的Z_2涡激发和涡诱导的拓扑转变可以捕获的动态自旋关联。特别地,动力学自旋结构因子在Z_2涡旋跃迁附近呈现出一个特征中心峰,该中心峰将是Z_2涡旋激发的指纹。

英文摘要:

Dynamical properties of the classical Heisenberg antiferromagnet on the triangular lattice are investigated by means of a spin-dynamics simulation and an analytical calculation. While the model was suggested to exhibit a topological transition driven by the Z_2-vortex binding-unbinding, weakness of the associated thermodynamic singularity has made it difficult to observe the evidence of the Z_2 vortex experimentally so far, only some indirect support. Here, we show that the signature of the Z_2-vortex excitation and the vortex-induced topological transition can be captured from the dynamical spin correlations. In particular, the dynamical spin structure factor exhibits a characteristic central peak around the Z_2-vortex transition, and this central peak will be a fingerprint of the Z_2-vortex excitation.

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。

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