纤锌矿与闪锌矿氮化镓光电阴极的自旋极化光电子发射测量
Measurement of Spin-Polarized Photoemission from Wurtzite and Zinc-Blende Gallium Nitride Photocathodes
AI总结：
该研究首次测量外延生长并激活至NEA的纤锌矿与闪锌矿GaN光电阴极，借助Mott偏振计和可调谐OPA获得17%与29%的峰值自旋极化，并建模分析及讨论相关机制。
摘要：
纤锌矿和闪锌矿氮化镓（GaN）光电阴极的自旋极化光电子发射首次得到观测和测量。p型掺杂GaN光电阴极采用外延生长，并通过在其表面沉积铯单层而激活至负电子亲和势（NEA）。研究使用一台场减速Mott偏振计，测量从价带顶光发射出的电子的自旋极化。利用为提供低带宽光而构建的可调谐光学参量放大器（OPA）进行光谱扫描，结果显示纤锌矿和闪锌矿光电阴极的峰值自旋极化分别为17%和29%。文中采用一个考虑测量中实验参数的自旋极化模型分析了闪锌矿GaN的结果，同时讨论了影响所获纤锌矿GaN自旋极化值的可能机制。
英文摘要：
Spin-polarized photoemission from wurtzite and zinc-blende gallium nitride (GaN) photocathodes has been observed and measured for the first time. The p-doped GaN photocathodes were epitaxially grown and activated to negative electron affinity (NEA) with a cesium monolayer deposited on their surfaces. A field-retarding Mott polarimeter was used to measure the spin-polarization of electrons photoemitted from the top of the valence band. A spectral scan with a tunable optical parametric amplifier (OPA) constructed to provide low-bandwidth light revealed peak spin polarizations of 17% and 29% in the wurtzite and zinc-blende photocathodes, respectively. Zinc-blende GaN results are analyzed with a spin-polarization model accounting for experimental parameters used in the measurements, while possible mechanisms influencing the obtained spin polarization values of wurtzite GaN are discussed.
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