The European Physical Journal B

, Volume 62, Issue 1, pp 45–51 | Cite as

Spin-dependent shot noise in diluted-magnetic-semiconductor/ semiconductor heterostructures

Mesoscopic and Nanoscale Systems

Abstract.

We investigated the shot noise properties in the diluted-magnetic-semiconductor/semiconductor heterostructures, where the sp-d exchange interaction gives rise to a giant spin splitting when an external magnetic field is applied along the growth direction of the heterostructures. It is found that the noise becomes strongly spin-dependent and can be greatly modulated not only by the external magnetic and electric fields, but also by the structural configuration and geometric parameters. Both the spin-up and spin-down components of the noise spectral density can be greatly suppressed by the magnetic field. The Fano factor is notably sensitive to the transmission probabilities, which varies greatly with the spin-polarization, the external magnetic field, and the structural configuration.

PACS.

73.50.Td Noise processes and phenomena 75.50.Pp Magnetic semiconductors 72.25.-b Spin polarized transport 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Physics and Key Laboratory of Atomic and Molecular NanoSciences, Ministry of Education, Tsinghua UniversityBeijingP.R. China

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