超热平衡和线性响应的自旋噪声谱
Spin noise spectroscopy beyond thermal equilibrium and linear response
摘要：
根据涨落耗散定理，在热平衡中自旋涨落研究所获得的信息必然受到系统线性响应函数的约束。然而，通过包括弱射频磁场，我们表明，即使在严格的非极化合奏\emph{can}的内在和随机的自旋波动揭示相关性和耦合超出线性响应的潜在模式，并可用于研究非平衡，甚至多光子相干自旋现象。我们在$^{41}$ K碱金属原子的经典蒸气中证明了这种能力，其中自旋涨落单独直接揭示了拉比分裂，Mollow三重态和Autler-Townes二重态的形成，交流塞曼位移，甚至非线性多光子相干。
英文摘要：
Per the fluctuation-dissipation theorem, the information obtained from spin fluctuation studies in thermal equilibrium is necessarily constrained by the system's linear response functions. However, by including weak radiofrequency magnetic fields, we demonstrate that intrinsic and random spin fluctuations even in strictly unpolarized ensembles \emph{can} reveal underlying patterns of correlation and coupling beyond linear response, and can be used to study non-equilibrium and even multiphoton coherent spin phenomena. We demonstrate this capability in a classical vapor of $^{41}$K alkali atoms, where spin fluctuations alone directly reveal Rabi splittings, the formation of Mollow triplets and Autler-Townes doublets, ac Zeeman shifts, and even nonlinear multiphoton coherences.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
