Spin current shot noise as a probe of interactions in mesoscopic systems

Details Spin current shot noise as a probe of interactions in mesoscopic systems Spin current shot noise as a probe of interactions in mesoscopic systems

2003-08-15

arxiv.org/abs/cond-mat/0308313v3

Phys. Rev. Lett. 92, 106601 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 Figures, revised version, added references

Scientific paper

10.1103/PhysRevLett.92.106601

It is shown that the spin resolved current shot noise can probe attractive or repulsive interactions in mesoscopic systems. This is illustrated in two physical situations : i) a normal-superconducting junction where the spin current noise is found to be zero, and ii) a single electron transistor (SET), where the spin current noise is found to be Poissonian. Repulsive interactions may also lead to weak attractive correlations (bunching of opposite spins) in conditions far from equilibrium. Spin current shot noise can be used to measure the spin relaxation time $T_1$, and a set-up is proposed in a quantum dot geometry.

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