多道交换散射自旋极化法
Multi-channel exchange-scattering spin polarimetry
摘要：
电子自旋在现代凝聚态物理中发现的几乎所有新现象（高温超导、近藤效应、巨磁电阻、拓扑绝缘体、量子反常霍尔效应等）中都起着关键作用。然而，由于旋光仪效率低，对电子自旋的测量质量差，阻碍了材料科学的发展。在这里，我们展示了一个成像型交换散射旋光仪与经典的莫特旋光仪相比，5个数量级以上的效率。作为示范，我们研究了铋（111）电子态的精细自旋结构，发现在体态和表面态都有很强的Rashba型自旋劈裂行为。这一改进为以前所未有的精度研究新的自旋相关现象铺平了道路。
英文摘要：
Electron spin takes critical role in almost all novel phenomena discovered in modern condensed matter physics (High-temperature superconductivity, Kondo effect, Giant Magnetoresistance, topological insulator, quantum anomalous Hall effect, etc.). However, the measurements for electron spin is of poor quality which blocks the development of material sciences because of the low efficiency of spin polarimeter. Here we show an imaging type exchange-scattering spin polarimeter with 5 orders more efficiency compared with a classical Mott polarimeter. As a demonstration, the fine spin structure of electronic states in bismuth (111) is investigated, showing the strong Rashba type spin splitting behavior in both bulk and surface states. This improvement pave the way to study novel spin related phenomena with unprecedented accuracy.
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