Silicene is an emerging 2D material with advantages of high carrier mobility, compatibility with the silicon-based semiconductor industry, and the tunable gap by a vertical electrical field due to the buckling structure. In this work, we report a first-principles investigation on the spin injection system, which consists of a Fe(111)/silicene stack as the spin injector and pure silicene as the spin channel. An extremely high spin injection efficiency (SIE) close to 100% is achieved. The partial density of states of Fe layers in the Fe(111)/silicene stack shows that spin-down states dominate above the Fermi level, resulting in a negligible spin-up current and high SIE. The transmission spectra have been investigated to analyze the spin-resolved properties. The spin injection system based on silicene is promising for the efficient silicon-based spintronics devices such as switching transistors.

中文翻译：

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硅烯自旋电子学：用于高效自旋注入的 Fe(111)/硅烯系统

硅烯是一种新兴的二维材料，具有载流子迁移率高、与硅基半导体工业兼容、屈曲结构可通过垂直电场调节间隙等优点。在这项工作中，我们报告了自旋注入系统的第一性原理研究，该系统由作为自旋注入器的 Fe(111)/硅烯堆栈和作为自旋通道的纯硅烯组成。实现了接近 100% 的极高自旋注入效率 (SIE)。Fe(111)/硅烯叠层中 Fe 层的部分态密度表明自旋向下态在费米能级以上占主导地位，导致自旋向上电流和高 SIE 可忽略不计。已经研究了透射光谱以分析自旋分辨特性。