光散射模型中随机运动自旋的自旋噪声谱：双光束排列
Spin noise spectroscopy of randomly moving spins in the model of light scattering: Two-beam arrangement
摘要：
本文给出了自旋载流子随机运动的体介质中自旋噪声信号形成问题的严格解析解。在具有波动不均匀性的介质中的光散射模型中进行处理。随着传统的单光束，几何形状，我们考虑双光束的安排，与辅助（“倾斜”）光束外差的光检测器上的散射场照射的主光束。它示出的自旋噪声信号中检测到的双光束的安排是高度敏感的运动（扩散）的自旋载流子内的照明体积，从而可以提供额外的信息自旋动力学和空间相关性的自旋极化在体积介质。我们的定量估计表明，在实际的实验条件下，自旋扩散可以强烈抑制自旋噪声信号在两束几何。这种抑制的机制类似于飞行时间展宽的机制，其临界距离由两个光束的空间干涉周期而不是由光束直径确定。
英文摘要：
A strict analytical solution of the problem of spin-noise signal formation in a volume medium with randomly moving spin carriers is presented. The treatment is performed in the model of light scattering in a medium with fluctuating inhomogeneity. Along with conventional single-beam, geometry, we consider the two-beam arrangement, with the scattering field of the auxiliary ("tilted") beam heterodyned on the photodetector illuminated by the main beam. It is shown that the spin noise signal detected in the two-beam arrangement is highly sensitive to motion (diffusion) of the spin carriers within the illuminated volume and thus can provide additional information about spin dynamics and spatial correlations of spin polarization in volume media. Our quantitative estimates show that, under real experimental conditions, spin diffusion may strongly suppress the spin-noise signal in the two-beam geometry. Mechanism of this suppression is similar to that of the time-of-flight broadening with the critical distance determined by the period of spatial interference of the two beams rather than by the beam diameter.
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