Raman scattering model of the spin noise

Abstract

The mechanism of formation of the polarimetric signal observed in the spin noise spectroscopy (SNS) is analyzed from the viewpoint of the light scattering theory. A rigorous calculation of the polarimetric signal (Faraday rotation or ellipticity) recorded in the SNS is presented in the approximation of single scattering. We show that it is most correctly to consider this noise as a result of scattering of the probe light beam by fluctuating susceptibility of the medium. Fluctuations of the gyrotropic (antisymmetric) part of the susceptibility tensor lead to appearance of the typical for the SNS Faraday rotation noise at the Larmor frequency. At the same time, fluctuations of linear anisotropy of the medium (symmetric part of the susceptibility tensor) give rise to the ellipticity noise of the probe beam spectrally localized at the double Larmor frequency. The results of the theoretical analysis well agree with the experimental data on the ellipticity noise in cesium vapor.

Spin-noise spectroscopy of a spin-one system

“…However, these results are usually described as if they had been performed with a spin-1/2 system, which can lead only to conventional orientation noise for the linearly polarized probe laser [12][13][14]. Systems with a spin higher than 1 can exhibit much richer SNS signals such as ellipticity noise, which can give rise to polarization dependent resonances at both the Larmor and twice the Larmor frequencies [15][16][17]. High spin systems are ubiquitous and used in many applications in modern quantum technologies [18][19][20][21]: understanding their dynamics and the corresponding spontaneous noise can thus have both fundamental and technological interests.…”

Acoustic frequency atomic spin oscillator in the quantum regime

“…G1). The second term affects the spin noise at Ω = 0 and Ω = 2Ω S since the matrix element [35]. We observe both the Ω = 2Ω S and Ω = 0 spectral components (Fig.…”

Anomalous light-induced broadening of the spin-noise resonance in cesium vapor

“…The main stream of research in the field of SNS has arisen in our century after successful detection of spin-noise resonances in semiconductors [2,3]. Nowadays, the SNS is widely used not only for studying magnetic resonance and spin dynamics of diverse paramagnets, as a specific method of electron paramagnetic resonance (EPR) spectroscopy, but also for studying properties of optical transitions [4,5], spatial spin distribution [6,7], nuclear spin dynamics in semiconductor structures [8][9][10], spin alignment noise in atomic systems [11,12], etc., see Refs. [13][14][15][16][17] for review.…”