论文标题
CA $ _2 $ CUO $ _3 $的移动轨道：洪德交换的关键作用
Mobile orbitons in Ca$_2$CuO$_3$: crucial role of the Hund's exchange
论文作者
论文摘要
我们研究了准抗抗铁磁铁的cu $ l_3 $ edge resonant非弹性X射线散射（RIX）光谱ca $ _2 $ cuo $ _3 $。除了由两翼连续体很好地描述的磁激发外，我们还观察到两个色散轨道激发，$ 3D_ {xy} $和$ 3D_ {yz} $ orbitons。我们对带有两个独特的入射极化获得的RIXS光谱进行定量比较，并具有理论模型。我们表明，任何现实的旋转轨道模型都需要包括一个有限但现实的hund的交换$ j_h \约0.5 $ eV。它的主要影响是轨道速度的增加，因此其理论上计算的值与实验观察到的值相匹配。即使Hund的交换也介导了Spinon和Orbiton之间的某种相互作用，但自旋轨道分离的图像仍然完好无损，并描述了该化合物中的Orbiton运动。
We investigate the Cu $L_3$ edge resonant inelastic x-ray scattering (RIXS) spectra of a quasi-1D antiferromagnet Ca$_2$CuO$_3$. In addition to the magnetic excitations, which are well-described by the two-spinon continuum, we observe two dispersive orbital excitations, the $3d_{xy}$ and the $3d_{yz}$ orbitons. We carry out a quantitative comparison of the RIXS spectra, obtained with two distinct incident polarizations, with a theoretical model. We show that any realistic spin-orbital model needs to include a finite, but realistic, Hund's exchange $J_H \approx 0.5$ eV. Its main effect is an increase in orbiton velocities, so that their theoretically calculated values match those observed experimentally. Even though Hund's exchange also mediates some interaction between spinon and orbiton, the picture of spin-orbit separation remains intact and describes orbiton motion in this compound.
