title: Coulomb promotion of spin-dependent tunneling.
abstract: 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.
authors.affiliation: Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
authors.forename: L Y
authors.initials: LY
authors.lastname: Gorelik
authors.forename: S I
authors.initials: SI
authors.lastname: Kulinich
authors.forename: R I
authors.initials: RI
authors.lastname: Shekhter
authors.forename: M
authors.initials: M
authors.lastname: Jonson
authors.forename: V M
authors.initials: VM
authors.lastname: Vinokur