论文标题
旋转激光器：超越磁力
Spin-Lasers: Spintronics Beyond Magnetoresistance
论文作者
论文摘要
在半导体激光器中引入自旋极化载体揭示了一种替代室温旋转式应用的替代途径，超出了常规的磁性效应。通过载体重组，将自旋极化载体的角动量转移到光子上，从而导致圆形极化的发射光。可以从简单的铲斗和谐波振荡器模型中获得此类自旋激光器的直觉，分别阐明其稳态和动态响应。这些激光器扩展了自旋设备的功能，并超过了常规（自旋 - 非极化）激光器的性能，包括更快的调制频率。令人惊讶的是，这种超快操作依赖于短载体自旋松弛时间和折射率的大型各向异性，这两者都被视为在旋转三位型和常规激光器上有害。自旋激光器提供了一个平台，用于测试旋转设备中的新颖概念，并提供与更传统的Spintronics领域的进步相关的进度。
Introducing spin-polarized carriers in semiconductor lasers reveals an alternative path to realize room-temperature spintronic applications, beyond the usual magnetoresistive effects. Through carrier recombination, the angular momentum of the spin-polarized carriers is transferred to photons, thus leading to the circularly polarized emitted light. The intuition for the operation of such spin-lasers can be obtained from simple bucket and harmonic oscillator models, elucidating their steady-state and dynamic response, respectively. These lasers extend the functionalities of spintronic devices and exceed the performance of conventional (spin-unpolarized) lasers, including an order of magnitude faster modulation frequency. Surprisingly, this ultrafast operation relies on a short carrier spin relaxation time and a large anisotropy of the refractive index, both viewed as detrimental in spintronics and conventional lasers. Spin-lasers provide a platform to test novel concepts in spin devices and offer progress connected to the advances in more traditional areas of spintronics.
