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.
Similar content being viewed by others
References
Blanter, Ya.M., Büttiker, M.: Phys. Rep. 336, 1 (2000)
de-Picciotto, R., Reznikov, M., Heiblum, M., Umansky, V., Bunin, G., Mahalu, D.: Nature 389, 162 (1997)
Awschalom, D.D., Flatté, M.E.: Nat. Phys. 3, 153 (2007)
Sukhorukov, E.V., Burkard, G., Loss, D.: Phys. Rev. B 63, 125315 (2001)
Urban, D., Braun, M., König, J.: Phys. Rev. B 76, 125306 (2007)
Merchant, C.A., Marković, N.: J. Appl. Phys. 105, 07C711 (2009)
Hershfield, S., Davies, J.H., Hyldgaard, P., Stanton, C.J., Wilkins, J.W.: Phys. Rev. B 47, 1967 (1993)
Souza, F.M., Egues, J.C., Jauho, A.P.: Phys. Rev. B 75, 165303 (2007)
Merchant, C.A., Marković, N.: Phys. Rev. Lett. 100, 156601 (2008)
Rudziński, W., Barnaś, J.: Phys. Rev. B 64, 085318 (2001)
Nazarov, Y.V., Struben, J.J.R.: Phys. Rev. B 53, 15466 (1996)
Cottet, A., Belzig, W., Bruder, C.: Phys. Rev. B 70, 115315 (2004)
Djuric, I., Dong, B., Cui, H.L.: IEEE Trans. Nanotechnol. 4, 71 (2005)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
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
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-009-0550-1