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arXiv 1407.6937cond-mat.mes-hall
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非平衡自旋噪声和磁化率噪声

Nonequilibrium Spin Noise and Noise of Susceptibility

Pablo Schad, Boris N. Narozhny, Gerd Schön, Alexander Shnirman

摘要:

我们分析了驱动自旋系统中的非平衡涨落,并将它们与自旋磁化率噪声联系起来。在线性响应理论的精神,我们进一步涉及的$4$ -自旋关联函数平衡的磁化率噪声。我们表明,在对比的第二噪声(噪声的噪声),噪声的磁化率是一个直接的措施,在系统中的非高斯波动。我们开发了一个通用的框架计算噪声的磁化率使用的Majorana表示的自旋1/2运营商。我们说明我们的方法通过一个简单的例子耦合到耗散(欧姆)浴的非相互作用的自旋。

英文摘要:

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.

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。

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