Rusetsky V S, Golyashov V A, Eremeev S V, Kustov D A, Rusinov I P, Shamirzaev T S, Mironov A V, Demin A Yu, Tereshchenko O E
Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia.
CJSC "Ekran FEP", Novosibirsk 630060, Russia.
Phys Rev Lett. 2022 Oct 14;129(16):166802. doi: 10.1103/PhysRevLett.129.166802.
New spin-dependent photoemission properties of alkali antimonide semiconductor cathodes are predicted based on the detected optical spin orientation effect and DFT band structure calculations. Using these results, the Na_{2}KSb/Cs_{3}Sb heterostructure is designed as a spin-polarized electron source in combination with the Al_{0.11}Ga_{0.89}As target as a spin detector with spatial resolution. In the Na_{2}KSb/Cs_{3}Sb photocathode, spin-dependent photoemission properties were established through detection of a high degree of photoluminescence polarization and high polarization of the photoemitted electrons. It was found that the multi-alkali photocathode can provide electron beams with emittance very close to the limits imposed by the electron thermal energy. The vacuum tablet-type sources of spin-polarized electrons have been proposed for accelerators, which can exclude the construction of the photocathode growth chambers for photoinjectors.
基于检测到的光自旋取向效应和密度泛函理论（DFT）能带结构计算，预测了碱金属锑化物半导体阴极新的自旋相关光发射特性。利用这些结果，设计了Na₂KSb/Cs₃Sb异质结构作为自旋极化电子源，并结合Al₀.₁₁Ga₀.₈₉As靶作为具有空间分辨率的自旋探测器。在Na₂KSb/Cs₃Sb光电阴极中，通过检测到的高程度光致发光极化和光发射电子的高极化，确定了自旋相关光发射特性。研究发现，多碱光电阴极能够提供发射度非常接近电子热能所施加极限的电子束。已为加速器提出了真空平板型自旋极化电子源，这可以省去光注入器中光阴极生长室的构建。
