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arXiv 1809.04148cond-mat.str-elcond-mat.mtrl-sci
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用共振非弹性X射线散射检测晶格手性

Detecting Crystallographic Lattice Chirality using Resonant Inelastic X-ray Scattering

Sean Mongan, Zengye Huang, Trinanjan Datta, Takuji Nomura, Dao-Xin Yao

摘要:

晶体学手性的控制和检测是一个重要而具有挑战性的科学问题。手征性具有从医学物理到宇宙学的广泛含义,包括磁性系统中的亲密但微妙的连接,例如Mn $_{1-x}$ Fe $_{x}$ Si。X射线衍射技术与共振或偏振变化的实验装置目前被用来表征晶格手性。我们使用理论计算证明了间接$K$边缘双磁振子共振非弹性X射线散射(RIXS)光谱作为一种可行的实验技术来区分晶体旋向性的可行性。我们应用自旋波理论,最近发现的$\sqrt {5}\times\sqrt {5}$空缺有序硫族化合物Rb $_{0.89}$ Fe $_{1.58}$ Se $_{2}$为现实的X射线实验设置参数(入射能量,偏振,和布拉格角)表明,计算RIXS光谱是敏感的基本手性(右或左)的晶格。引入了一个Flack参数的定义,它包含了左右手征晶格RIXS响应。结果表明,多带磁振子系统RbFeSe的RIXS响应来自带间和带内散射过程。这些RIXS峰的消失或存活对潜在的手性晶格取向敏感。这又允许识别两个手性晶格取向。

英文摘要:

The control and detection of crystallographic chirality is an important and challenging scientific problem. Chirality has wide ranging implications from medical physics to cosmology including an intimate but subtle connection in magnetic systems, for example Mn$_{1-x}$Fe$_{x}$Si. X-ray diffraction techniques with resonant or polarized variations of the experimental setup are currently utilized to characterize lattice chirality. We demonstrate using theoretical calculations the feasibility of indirect $K$ -edge bimagnon resonant inelastic X-ray scattering (RIXS) spectrum as a viable experimental technique to distinguish crystallographic handedness. We apply spin wave theory to the recently discovered $\sqrt {5}\times\sqrt {5}$ vacancy ordered chalcogenide Rb$_{0.89}$Fe$_{1.58}$Se$_{2}$ for realistic X-ray experimental set up parameters (incoming energy, polarization, and Bragg angle) to show that the computed RIXS spectrum is sensitive to the underlying handedness (right or left) of the lattice. A Flack parameter definition that incorporates the right- and left- chiral lattice RIXS response is introduced. It is shown that the RIXS response of the multiband magnon system RbFeSe arises both from inter- and intra- band scattering processes. The extinction or survival of these RIXS peaks are sensitive to the underlying chiral lattice orientation. This in turn allows for the identification of the two chiral lattice orientations.

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