Low Temperature Physics: 33, 757 (2007); https://doi.org/10.1063/1.2780168 (5 pages)
Fizika Nizkikh Temperatur: Volume 33, Number 9 (September 2007), p. 997-1001 ( to contents , go back )
Giant super-poissonian shot noise in spin-polarized SET structures
L.Y. Gorelik1, S.I. Kulinich2,3, R.I. Shekhter2, M. Jonson2, and V.M. Vinokur4
1Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
2Department of Physics, Göteborg University, SE-412 96 Göteborg, Sweden
3B.I. Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Ave., 61103 Kharkov, Ukraine
4Materials Science Division, Argonne National Laboratory, 9700 South Cass Av, Argonne, Illinois 60439, USA
Received January 15, 2007
We study transport of spin-polarized electrons through a magnetic single-electron transistor (SET) in the presence of an external magnetic field. Assuming the SET to have a nanometer-sized central island with a single electron level, we find that the zero-frequency shot noise diverges as the on-dot spin-flip rate goes to zero, provided the source and drain leads are completely polarized in the same direction. We present an analytical expression for the low-frequency super-poissonian shot noise that allows one to specify the necessary conditions for the experimental observation of the phenomenon.
PACS: 73.23.–b Electronic transport in mesoscopic systems;
Key words: single-electron transistor, spin-flip time, shot-noise, Coulumb blockade, spin-polarized electrons.