Shot Noise in a Spin-Diode Geometry

  • F. M. SouzaEmail author
  • J. Del Nero
  • J. C. Egues
Original Paper


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.


Spintronics Shot noise Quantum dot 


  1. 1.
    Blanter, Ya.M., Büttiker, M.: Phys. Rep. 336, 1 (2000) CrossRefADSGoogle Scholar
  2. 2.
    de-Picciotto, R., Reznikov, M., Heiblum, M., Umansky, V., Bunin, G., Mahalu, D.: Nature 389, 162 (1997) CrossRefADSGoogle Scholar
  3. 3.
    Awschalom, D.D., Flatté, M.E.: Nat. Phys. 3, 153 (2007) CrossRefGoogle Scholar
  4. 4.
    Sukhorukov, E.V., Burkard, G., Loss, D.: Phys. Rev. B 63, 125315 (2001) CrossRefADSGoogle Scholar
  5. 5.
    Urban, D., Braun, M., König, J.: Phys. Rev. B 76, 125306 (2007) CrossRefADSGoogle Scholar
  6. 6.
    Merchant, C.A., Marković, N.: J. Appl. Phys. 105, 07C711 (2009) CrossRefGoogle Scholar
  7. 7.
    Hershfield, S., Davies, J.H., Hyldgaard, P., Stanton, C.J., Wilkins, J.W.: Phys. Rev. B 47, 1967 (1993) CrossRefADSGoogle Scholar
  8. 8.
    Souza, F.M., Egues, J.C., Jauho, A.P.: Phys. Rev. B 75, 165303 (2007) CrossRefADSGoogle Scholar
  9. 9.
    Merchant, C.A., Marković, N.: Phys. Rev. Lett. 100, 156601 (2008) CrossRefADSGoogle Scholar
  10. 10.
    Rudziński, W., Barnaś, J.: Phys. Rev. B 64, 085318 (2001) CrossRefADSGoogle Scholar
  11. 11.
    Nazarov, Y.V., Struben, J.J.R.: Phys. Rev. B 53, 15466 (1996) CrossRefADSGoogle Scholar
  12. 12.
    Cottet, A., Belzig, W., Bruder, C.: Phys. Rev. B 70, 115315 (2004) CrossRefADSGoogle Scholar
  13. 13.
    Djuric, I., Dong, B., Cui, H.L.: IEEE Trans. Nanotechnol. 4, 71 (2005) CrossRefADSGoogle Scholar

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

Personalised recommendations