SrTiO $_3$中的亚原子碰撞和涡旋光束
Sub-Atomic Channeling and Vortex Beams in SrTiO$_3$
摘要：
最近的实验亚原子测量的启发，使用分析像差校正扫描透射电子显微镜（STEM），我们研究了电子探针在结晶SrTiO $_3$在亚原子长度尺度上的传播。在这里，我们报告的亚原子通道的存在和形成的涡旋光束在这个尺度上。在不同晶体温度和STEM探针会聚角（10至50 mrad）和光束能量（80至300 keV）下进行的光束传播模拟结果表明，降低环境温度可以增强亚原子通道，STEM探针参数可以用于控制涡旋光束并调节其强度，速度和面积。
英文摘要：
Inspired by recent experimental sub-atomic measurements using analytical aberration-corrected scanning transmission electron microscopes (STEMs), we studied electron probe propagation in crystalline SrTiO$_3$ at the sub-atomic length scale. Here, we report the existence of sub-atomic channeling and the formation of a vortex beam at this scale. The results of beam propagation simulations, which are performed at various crystal temperatures and STEM probe convergence angles (10 to 50 mrad) and beam energies (80 to 300 keV), showed that reducing the ambient temperature can enhance the sub-atomic channeling and that STEM probe parameters can be used to control the vortex beams and adjust their intensity, speed, and area.
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