Spin noise spectroscopy beyond thermal equilibrium and linear response

Abstract

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.

arXiv comment5 pages, 4 figures

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Cited by in corpus (30)

• The Theory of Spin Noise Spectroscopy: A Review
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• Spin-noise-based magnetometry of an $n$-doped GaAs microcavity in the field of elliptically polarized light
• Quantum Dynamics of Collective Spin States in a Thermal Gas
• Probing Many-Body Localization by Spin Noise Spectroscopy
• Sensitivity, quantum limits, and quantum enhancement of noise spectroscopies
• Measurements of spin properties of atomic systems in and out of equilibrium via noise spectroscopy
• Spin and reoccupation noise in a single quantum dot beyond the fluctuation-dissipation theorem
• Higher order spin noise spectroscopy of atomic spins in fluctuating external fields
• Spin fluctuations of non-equilibrium electrons and excitons in semiconductors
• Spin noise of localized electrons interacting with optically cooled nuclei
• Spin noise spectroscopy of an alignment-based atomic magnetometer
• Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light
• Spin noise at electron paramagnetic resonance
• Collision-induced spin noise
• Shot noise as a probe of spin-correlated transport through single atoms
• Spin noise spectroscopy of a noise-squeezed atomic state
• Optical Resonance Shift Spin Noise Spectroscopy
• Zero-field spin noise spectrum of an alkali vapor with strong spin-exchange coupling
• Nonlinear spectroscopy of high-spin fluctuations
• Evolution of the inhomogeneously-broadened spin noise spectrum with ac drive
• Spin noise spectroscopy of optical light shifts
• Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
• Fourth-order spin correlation function in the extended central spin model
• Anomalous light-induced broadening of the spin-noise resonance in cesium vapor
• Spin-qubit noise spectroscopy from randomized benchmarking by supervised learning
• Creation and dynamics of spin fluctuations in a noisy magnetic field
• Anomalous high-density spin noise in a strongly interacting atomic vapor
• Valley polarization fluctuations, bistability, and switching in two-dimensional semiconductors