准平衡自旋阀中的非普适散粒噪声
Non-universal shot noise in quasiequilibrium spin valves
摘要：
我们表明，由于电子-电子散射扩散自旋阀的Wiedemann-Franz定律的故障可能会导致在一个强大的抑制的Fano因子，描述了散粒噪声和平均电流之间的比率。在磁化的平行配置中，我们在没有正常金属间隔层的情况下找到通用值$\sqrt{3}/4$，但是包括间隔层导致在回到大间隔层长度的通用值之前对该值的非单调抑制。另一方面，在具有可忽略的小间隔物的反平行配置的情况下，Fano因子为$\sqrt{3 (1-P^2)}/4$，其中$P$表示电导率的极化。对于$P\rightarrow \pm 1$，通过系统的电流几乎没有噪声。
英文摘要：
We show that the breakdown of the Wiedemann-Franz law due to electron--electron scattering in diffusive spin valves may result in a strong suppression of the Fano factor that describes the ratio between shot noise and average current. In the parallel configuration of magnetizations, we find the universal value $\sqrt{3}/4$ in the absence of a normal-metal spacer layer, but including the spacer leads to a non-monotonous suppression of this value before reaching back to the universal value for large spacer lengths. On the other hand, in the case of an antiparallel configuration with a negligibly small spacer, the Fano factor is $\sqrt{3 (1-P^2)}/4$, where $P$ denotes the polarization of the conductivities. For $P\rightarrow \pm 1$, the current through the system is almost noiseless.
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