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Shot Noise in a Spin-Diode Geometry

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Abstract

We apply the master equation technique to calculate shot noise in a system composed of single level quantum dot attached to a normal metal lead and to a ferromagnetic lead (NM-QD-FM). It is known that this system operates as a spin-diode, giving unpolarized currents for forward bias and polarized current for reverse bias. This effect is observed when only one electron can tunnel at a time through the dot, due to the strong intradot Coulomb interaction. We find that the shot noise also presents a signature of this spin-diode effect, with a super-Poissonian shot noise for forward and a sub-Poissonian shot noise for reverse bias voltages. The shot noise thus can provide further experimental evidence of the spin-rectification in the NM-QD-FM geometry.

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Correspondence to F. M. Souza.

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Souza, F.M., Del Nero, J. & Egues, J.C. Shot Noise in a Spin-Diode Geometry. J Supercond Nov Magn 23, 45–48 (2010). https://doi.org/10.1007/s10948-009-0550-1

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  • DOI: https://doi.org/10.1007/s10948-009-0550-1

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