Spin dynamics of the bilinear-biquadratic S =1 Heisenberg model on the triangular lattice: A quantum Monte Carlo study
Spin dynamics of the bilinear-biquadratic S =1 Heisenberg model on the triangular lattice: A quantum Monte Carlo study
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DOI：
10.1103/physrevb.91.165128
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发表时间：
2014-12
影响因子：
3.7
通讯作者：
A. Voll;S. Wessel
中科院分区：
文献类型：
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作者：
A. Voll;S. Wessel
研究了三角晶格上具有双线性-双二次交换作用的O（3）对称自旋1海森堡模型的热力学性质以及动力学自旋和四极结构因子.基于无符号问题的量子Monte Carlo方法，我们获得了铁磁和铁四极有序的自旋双极相以及分离这些相的SU（3）对称点。Goldstone软模式的动态自旋和四极结构因子的签名被确定，和低能量激发的性质相比，在有限的温度下观察到的热力学行为，以及Schwinger玻色子味波理论。
We study thermodynamic properties as well as the dynamical spin and quadrupolar structure factors of the O(3)-symmetric spin-1 Heisenberg model with bilinear-biquadratic exchange interactions on the triangular lattice. Based on a sign-problem-free quantum Monte Carlo approach, we access both the ferromagnetic and the ferroquadrupolar ordered, spin nematic phase as well as the SU(3)-symmetric point which separates these phases. Signatures of Goldstone soft-modes in the dynamical spin and the quadrupolar structure factors are identified, and the properties of the low-energy excitations are compared to the thermodynamic behavior observed at finite temperatures as well as to Schwinger-boson flavor-wave theory.