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arXiv · 1407.6937

Nonequilibrium Spin Noise and Noise of Susceptibility

Pablo Schad·Boris N. Narozhny·Gerd Schön·Alexander Shnirman
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Abstract

We analyze out-of-equilibrium fluctuations in a driven spin system and relate them to the noise of spin susceptibility. In the spirit of the linear response theory we further relate the noise of susceptibility to a $4$-spin correlation function in equilibrium. We show that, in contrast to the second noise (noise of noise), the noise of susceptibility is a direct measure of non-Gaussian fluctuations in the system. We develop a general framework for calculating the noise of susceptibility using the Majorana representation of spin-1/2 operators. We illustrate our approach by a simple example of non-interacting spins coupled to a dissipative (Ohmic) bath.

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Pablo Schad, Boris N. Narozhny, Gerd Schön, Alexander Shnirman. 2014-07-25. Nonequilibrium Spin Noise and Noise of Susceptibility. https://doi.org/10.1103/physrevb.90.205419

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