论文标题
共振旋转放大符合$ n $ -GAA的电子自旋共振
Resonant spin amplification meets electron spin resonance in $n$-GaAs
论文作者
论文摘要
通过连续的激光脉冲在相相上与Larmor自旋进动对磁场的循环激光脉冲对电子自旋极化的周期性激发导致共振自旋扩增（RSA）。我们观察到在外部振荡磁场的影响下，RSA在$ n $掺杂的散装GAA中进行了彻底的修改。我们发现双峰电子旋转共振，而不是预期无光泵的单峰共振。频率分裂随场振荡的幅度线性增加，而自旋偏差则四次增加。此外，我们表明振荡场既可以显着抑制RSA并引起新的共振条件。使用四元化来描述自旋旋转，我们开发了一种理论，该理论同时考虑了旋转进动，衰减和放大，并重现了整个实验数据集。使用射频场可以控制RSA的条件并实现平均自旋极化的微调，而无需修改光学泵的参数。
Periodic excitation of electron spin polarization by consecutive laser pulses in phase with Larmor spin precession about a magnetic field results in resonant spin amplification (RSA). We observe a drastic modification of RSA in $n$-doped bulk GaAs under the influence of external oscillating magnetic field. We find a double-peaked electron spin resonance instead of a single-peaked resonance expected without optical pumping. The frequency splitting increases linearly with amplitude of field oscillations, while the spin deviation increases quadratically. Moreover, we show that the oscillating field can both significantly suppress RSA and induce new conditions for resonance. Using quaternions to describe spin rotations, we develop a theory that simultaneously considers spin precession, decay, and amplification and reproduces the entire set of the experimental data. Using the radio-frequency field allows one to control the conditions of RSA and achieve fine tuning of average spin polarization without modifying the parameters of optical pumping.
