$\rm Sr_2 Ir O_4$中轨道内和轨道间关联电子自旋动力学：自旋波带隙和自旋轨道激子
Intra- and inter-orbital correlated electron spin dynamics in $\rm Sr_2 Ir O_4$: spin-wave gap and spin-orbit exciton
摘要：
将库仑相互作用项变换到由自旋-轨道耦合产生的$J=1/2$和$3/2$态构成的赝轨道基提供了一个通用的工具。这种形式主义适用于调查磁各向异性对低能自旋波激发以及高能自旋轨道激子模式在$\rm Sr_2 Ir O_4$的影响。Hund的耦合项明确地产生易平面各向异性，导致无间隙（面内）和有间隙（面外）模式，与最近的共振非弹性X射线散射（RIXS）测量结果一致。轨道间的集体模式，自旋翻转，粒子-空穴激发与适当的相互作用强度和重整化的自旋-轨道间隙产生两个定义良好的传播自旋-轨道激子模式，与能量尺度和色散与RIXS研究很好地吻合。
英文摘要：
Transformation of Coulomb interaction terms to the pseudo-orbital basis constituted by $J=1/2$ and $3/2$ states arising from spin-orbit coupling provides a versatile tool. This formalism is applied to investigate magnetic anisotropy effects on low-energy spin-wave excitations as well as high-energy spin-orbit exciton modes in $\rm Sr_2 Ir O_4$. The Hund's coupling term explictly yields easy-plane anisotropy, resulting in gapless (in-plane) and gapped (out-of-plane) modes, in agreement with recent resonant inelastic x-ray scattering (RIXS) measurements. The collective mode of inter-orbital, spin-flip, particle-hole excitations with appropriate interaction strengths and renormalized spin-orbit gap yields two well-defined propagating spin-orbit exciton modes, with energy scale and dispersion in good agreement with RIXS studies.
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。
