Coulomb promotion of spin-dependent tunneling.
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 size central island with a single-electron level we find that the interplay on the island between coherent spin-flip dynamics and Coulomb interactions can make the Coulomb correlations promote rather than suppress the current through the device. We find the criteria for this new phenomenon--Coulomb promotion of spin-dependent tunneling--to occur.
Gorelik
L Y
LY
Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Kulinich
S I
SI
Shekhter
R I
RI
Jonson
M
M
Vinokur
V M
VM