论文标题
集体模式激发和模拟$ l $ - 谐振弹性X射线散射光谱中的反铁磁性ca $ _2 $ ruo $ _4 $
Collective mode excitations and simulated $L$-edge resonant-inelastic x-ray scattering spectra in antiferromagnetic Ca$_2$RuO$_4$
论文作者
论文摘要
使用三轨哈伯德模型，我们研究了Ca $ _2 $ ruo $ _4 $的抗铁磁阶段中的低能激发光谱。我们通过随机相近似计算低能区域中的动力敏感性，并发现横向模式的各向异性分散与非弹性中子散射实验最近报道的光谱非常吻合。通过快速胶合近似，我们模拟了从动力学敏感性中模拟Ru $ L_3 $ edge的共振非弹性X射线散射（RIX）光谱。我们表明，在计算出的Rixs光谱中清楚地观察到了横向模式的分散体，并且入射X射线的极化依赖性使一个人能够区分平面内横向模式的激发和平面外横向模式。
Using the three-orbital Hubbard model, we investigate the low-energy excitation spectra in the antiferromagnetic phase of Ca$_2$RuO$_4$. We calculate the dynamical susceptibilities in the low-energy region by the random phase approximation and find that the anisotropic dispersion of the transverse mode is in good agreement with the spectra recently reported by inelastic neutron scattering experiments. By the fast-collision approximation, we simulate the resonant inelastic x-ray scattering (RIXS) spectra of the Ru $L_3$ edge from the dynamical susceptibilities. We show that the dispersion of the transverse mode is clearly observed in the calculated RIXS spectra and that the polarization dependence of the incident x rays enables one to distinguish between the excitations of the in-plane transverse mode and out-of-plane transverse mode.
