Evaluating Lead Halide Perovskite Nanocrystals as a Spin Laser Gain Medium
Evaluating Lead Halide Perovskite Nanocrystals as a Spin Laser Gain Medium
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评估卤化铅钙钛矿纳米晶体作为自旋激光增益介质
DOI：
10.1021/acs.nanolett.1c03671
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发表时间：
2022
期刊：
影响因子：
10.8
通讯作者：
Du Jiangfeng
中科院分区：
文献类型：
--
作者：
Tang Beibei;Li Guihai;Ru Xuechun;Gao Yan;Li Zidu;Shen Huaibin;Yao Hong-Bin;Fan Fengjia;Du Jiangfeng
自旋极化电荷不仅赋予传统激光器新的功能，而且由于自旋简并的提高而降低了激光阈值。II-VI和III-V半导体作为自旋激光增益介质已被广泛研究；然而，极化程度受到轻空穴和重空穴简并的限制。在此，我们评估了cspbbr3纳米晶体作为自旋激光器增益介质的潜力。cspbbr3纳米晶体具有低带边简并并因此具有高极化程度（由于倒置的带结构和大的自旋轨道耦合）。实验和数值模拟结果表明，在自旋弛豫寿命内，圆偏振光激发可以降低电荷的光增益阈值。然而，要实现自旋激光器，需要延长自旋弛豫寿命。
Spin-polarized charge endows conventional lasers with not only new functionalities but also reduced lasing thresholds thanks to the lifting of spin degeneracy. II–VI and III–V semiconductors have been extensively investigated as spin laser gain mediums; however, the degree of polarization is limited by the light hole and heavy hole degeneracy. Herein, we evaluate the potential of CsPbBr3nanocrystals─ones that are featured with low band-edge degeneracy and therefore a high degree of polarization as a result of inverted band structure and large spin–orbit coupling─as a gain medium for spin lasers. Our experiment and numerical modeling results reveal that, within the spin relaxation lifetime, the optical gain threshold can be depressed by polarizing the charge using circularly polarized photoexcitation. However, prolonging the spin relaxation lifetime is required to realize a spin laser.