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We present theoretical study of shot noise in single wall metallic carbonnanotubes weakly coupled to either nonmagnetic or ferromagnetic leads. Usingthe real-time diagrammatic technique, we calculate the current, Fano factor andtunnel magnetoresistance in the sequential tunneling regime. It is shown thatthe differential conductance displays characteristic four-fold periodicity,indicating single-electron charging. Such a periodicity is also visible intunnel magnetoresistance of the system as well as in the Fano factor. Thepresent studies elucidate the impact of ferromagnetic (vs. nonmagnetic)contacts on the transport characteristics under consideration.

Theory of shot noise in single-walled metallic carbon nanotubes weakly coupled to nonmagnetic and ferromagnetic leads