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.

Keywords

Spintronics Shot noise Quantum dot 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.International Center for Condensed Matter PhysicsUniversidade de BrasíliaBrasíliaBrazil
  2. 2.Instituto de FísicaUniversidade Federal de UberlândiaUberlândiaBrazil
  3. 3.Departamento de FísicaUniversidade Federal do ParáBelémBrazil
  4. 4.Departamento de Física e Informática, Instituto de Física de São CarlosUniversidade de São PauloSão CarlosBrazil

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