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Bulletin of the American Physical Society

Revealing spin-spin correlations in atomic vapors and semiconductor heterostructures using spin noise spectroscopy

Dibyendu Roy, Nikolai A. Sinitsyn

Published Mar 6, 2014• 0 citations
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We discuss the effect of external noisy magnetic fields on mesoscopic spin fluctuations that can be probed in semiconductors and atomic vapors by means of optical spin-noise spectroscopy. We show that conventional arguments of the law of large numbers do not apply to spin correlations induced by external fields, namely, the magnitude of the 4th-order spin cumulant grows as $\ensuremath{\sim}{N}^{2}$ with the number NNN of observed spins, i.e., it is not suppressed in comparison to the 2nd-order cumulant. This allows us to design a simple experiment to measure the 4th-order cumulant of spin fluctuations in an atomic system near thermodynamic equilibrium and develop a quantitative theory that explains all observations.