arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2401.04719cond-mat.mtrl-sci
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大角度非弹性电子散射:声子极化激元的贡献

Inelastic electron scattering at large angles: the phonon polariton contribution

Hongbin Yang, Paul Zeiger, Andrea Konečná, Lu Han, Guangyao Miao, Yinong Zhou, Yifeng Huang, Xingxu Yan, Weihua Wang, Jiandong Guo, Yuefeng Nie, Ruqian Wu, Jan Rusz, Xiaoqing Pan

AI总结:

本文挑战了大角度下排除声子极化激元的假设,证明电子束通过多重散射可激发声子与声子极化激元,并结合介电理论、密度泛函理论和多片层模拟提供了理解极性光学声子材料中相互作用的综合框架。

摘要:

我们研究了SrTiO3、PbTiO3和SiC在声子能量范围内的非弹性电子散射,挑战了在高分辨率透射电子能量损失谱中大角度下排除声子极化激元的假设。我们证明,通过多重散射,电子束可以激发声子和声子极化激元,且两者的相对比例随结构因子和散射角而变化。结合介电理论、密度泛函理论和多片层模拟,我们为理解具有极性光学声子材料中的这些相互作用提供了一个综合框架。

英文摘要:

We explore the inelastic electron scattering in SrTiO3, PbTiO3, and SiC in their phonon energy range, challenging the assumption that phonon polaritons are excluded at large angles in high-resolution transmission electron energy-loss spectroscopy. We demonstrate that through multiple scattering, the electron beam can excite both phonons and phonon polaritons, and the relative proportion of each varies depending on the structure factor and scattering angle. Integrating dielectric theory, density functional theory, and multi-slice simulations, we provide a comprehensive framework for understanding these interactions in materials with polar optical phonons.

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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