Shot noise in the Kondo regime of a quantum-dot–ferromagnet system irradiated with microwave fields
Key Laboratory of Cluster Science of Ministry of Education, and Department of Physics, Beijing Institute of Technology - Beijing 100081, PRC
Accepted: 6 January 2011
The shot noise of a quantum dot (QD) coupled to the ferromagnetic terminals under the perturbation of microwave fields (MWFs) in the Kondo regime has been derived by employing the nonequilibrium Green's function approach. The photon-assisted shot noise associated with the spin-polarized electron tunneling in the Kondo regime has been derived and calculated to reveal significant results for spintronics. The modification of shot noise induced by the polarization angle and spin-polarized linewidths exhibits clearly. The Fano factor displays the photon-assisted effect more efficiently for the circumstance of smaller linewidths. The shot noise is suppressed and enhanced by the MWFs, and it shows sub-Poissonian and super-Poissonian features.
PACS: 85.35.-p – Nanoelectronic devices / 73.23.-b – Electronic transport in mesoscopic systems / 73.21.La – Quantum dots
© EPLA, 2011