基于Mott散射的多通道自旋分辨电子分析器概念
Concept of multichannel spin-resolving electron analyzer based on Mott scattering
摘要：
提出了一种基于光学成像原理和莫特散射（iMott）的多通道电子自旋探测器概念。由标准角分辨（光）电子分析仪或显微镜产生的多通道电子图像通过静电透镜在40 keV的加速电压下重新成像到Au靶上。带有Mott散射自旋不对称性的准弹性电子通过磁透镜成像到位置敏感的电子CCD上，其差分信号产生多通道自旋不对称图像。这个概念的基本优点包括接受固有的发散电子源从电子分析仪或显微镜焦平面以及小的像差凭借高加速电压实现，如广泛的射线跟踪分析所示。与单通道Mott检测器相比，效率增益可以是1e4以上的因子，这不仅在标准体相和表面体系（Rashba效应、拓扑绝缘体等）的应用中开辟了自旋分辨光谱学的新前景。而且涉及掩埋异质结构。同步自旋检测和快速CCD读出使iMott探测器在X射线自由电子激光设施中得到有效利用。
英文摘要：
Concept of a multichannel electron spin detector based on optical imaging principles and Mott scattering (iMott) is presented. A multichannel electron image produced by standard angle-resolving (photo) electron analyzer or microscope is re-imaged by an electrostatic lens at an accelerating voltage of 40 keV onto the Au target. Quasi-elastic electrons bearing spin asymmetry of the Mott scattering are imaged by magnetic lenses onto position-sensitive electron CCDs whose differential signals yield the multichannel spin asymmetry image. Fundamental advantages of this concept include acceptance of inherently divergent electron sources from the electron analyzer or microscope focal plane as well as small aberrations achieved by virtue of high accelerating voltages, as demonstrated by extensive ray-tracing analysis. The efficiency gain compared to the single-channel Mott detector can be a factor of more than 1e4 which opens new prospects of spin-resolved spectroscopies in application not only to standard bulk and surface systems (Rashba effect, topological insulators, etc.) but also to buried heterostructures. The simultaneous spin detection and fast CCD readout enable efficient use of the iMott detectors at X-ray FEL facilities.
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