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arXiv 0710.0695cond-mat.mtrl-sci
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六方氮化硼的非共振X射线拉曼散射激子光谱

Exciton spectroscopy of hexagonal boron nitride using non-resonant x-ray Raman scattering

Yejun Feng, J. A. Soininen, A. L. Ankudinov, J. O. Cross, G. T. Seidler, A. T. Macrander, J. J. Rehr, E. L. Shirley

摘要:

我们报告非共振X射线拉曼散射(XRS)测量从六方氮化硼转移动量从2到9 $\mathrmÅ^{-1}$沿方向和出基面。一个基于量子力学的论证,连同球谐函数基中投影态密度的实空间全多重散射计算,揭示了一个强的前边缘特征是一个占主导地位的$Y_{10}$型Frenkel激子,没有其他\textit{s} -,\textit{p} -,或\textit{d} -组件。这一结论得到了基于Bethe-Salpeter方程的\textbf{q}依赖性XRS截面的第二次独立计算的支持。

英文摘要:

We report non-resonant x-ray Raman scattering (XRS) measurements from hexagonal boron nitride for transferred momentum from 2 to 9 $\mathrmÅ^{-1}$ along directions both in and out of the basal plane. A symmetry-based argument, together with real-space full multiple scattering calculations of the projected density of states in the spherical harmonics basis, reveals that a strong pre-edge feature is a dominantly $Y_{10}$-type Frenkel exciton with no other \textit{s}-, \textit{p}-, or \textit{d}- components. This conclusion is supported by a second, independent calculation of the \textbf{q}-dependent XRS cross-section based on the Bethe-Salpeter equation.

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。

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