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arXiv 2008.02287cond-mat.str-elcond-mat.mtrl-sci
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具有Dzyaloshinskiii-Moriya相互作用的各向异性三角晶格反铁磁体Raman散射的力矩平衡自旋波理论

Torque equilibrium spin wave theory of Raman scattering in an anisotropic triangular lattice antiferromagnet with Dzyaloshinskii-Moriya interaction

Chao Shan, Shangjian Jin, Trinanjan Datta, Dao-Xin Yao

摘要:

本文应用转矩平衡自旋波理论(TESWT)研究了三角晶格中具有Dzyaloshinskiii-Moriya(DM)相互作用的各向异性XXZ反铁磁模型.以准粒子真空为参考,利用TESWT方法对受抑三角晶格磁体的非共线基态进行了精确的分析。我们阐明了量子涨落对基于模型系统参数的有序波矢的影响。我们研究了单磁振子色散,利用谱函数研究了双磁振子连续谱,以及双磁振子和三磁振子激发的喇曼谱。我们提出了我们的结果为$HH, VV$,和$HV$偏振拉曼几何依赖的双磁振子和三磁振子激发光谱,其中$H (V)$代表水平(垂直)偏振。我们的计算表明,$HH$和$HV$偏振光谱都可以用来确定我们的系统的各向异性程度。计算了Ba $_3$ CoSb $_2$ O $_9$和Cs $_2$ CuCl $_4$的拉曼光谱。

英文摘要:

We apply torque equilibrium spin wave theory (TESWT) to investigate an anisotropic XXZ antiferromagnetic model with Dzyaloshinskii-Moriya (DM) interaction in a triangular lattice. Considering the quasiparticle vacuum as our reference, we provide an accurate analysis of the non-collinear ground state of a frustrated triangular lattice magnet using the TESWT formalism. We elucidate the effects of quantum fluctuations on the ordering wave vector based on model system parameters. We study the single magnon dispersion, the two-magnon continuum using the spectral function, and the Raman spectrum of bimagnon and trimagnon excitations. We present our results for the $HH, VV$, and the $HV$ polarization Raman geometry dependence of the bimagnon and the trimagnon excitation spectrum where $H (V)$ represents horizontal (vertical) polarization. Our calculations show that both the $HH$ and the $HV$ polarization spectrum can be used to determine the degree of anisotropy of our system. We calculate the Raman spectra of Ba$_3$CoSb$_2$O$_9$ and Cs$_2$CuCl$_4$.

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