Threshold behavior in spin lasers: Spontaneous emission and nonlinear gain
Threshold behavior in spin lasers: Spontaneous emission and nonlinear gain
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DOI：
10.1063/5.0069125
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发表时间：
2021-10
影响因子：
4
通讯作者：
Gaofeng Xu;Krish Patel;I. Žutić
中科院分区：
文献类型：
--
作者：
Gaofeng Xu;Krish Patel;I. Žutić
注入了自旋极化载流子的自旋激光的一个特点是它们的阈值行为随着受激发射的开始。与传统非偏振载流子激光器的单一阈值不同，自旋激光器需要两个阈值。随着小型化激光的发展和新型二维材料的使用，目前尚不清楚通常的自旋激光假设的自发辐射和线性光学增益是否仍然适用，甚至不清楚如何识别激光阈值。我们的速率方程描述通过考虑大的自发辐射和非线性光学增益来解决这些问题。我们提供了一种透明的方法和分析结果来探索由此产生的阈值行为及其与先前研究的偏差，并指导未来的自旋激光作为超越磁阻的自旋电子学的通用平台。
A hallmark of spin-lasers, injected with spin-polarized carriers, is their threshold behavior with the onset of stimulated emission. Unlike the single threshold in conventional lasers with unpolarized carriers, two thresholds are expected in spin lasers. With the progress in scaled-down lasers and the use of novel two-dimensional materials it is unclear if the common description of spin lasers assuming a negligible spontaneous emission and linear optical gain remains relevant or even how to identify the lasing thresholds. Our rate-equation description addresses these questions by considering a large spontaneous emission and a nonlinear optical gain. We provide a transparent approach and analytical results to explore the resulting threshold behavior, its deviation from the prior studies, as well as guide future spin-lasers as a versatile platform for spintronics beyond magnetoresistance.