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Frontiers of Physics

ISSN 2095-0462

ISSN 2095-0470(Online)

CN 11-5994/O4

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Front. Phys.    2008, Vol. 3 Issue (3) : 280-293    https://doi.org/10.1007/s11467-008-0026-y
Shot noises of spin and charge currents in a ferromagnet-quantum-dot-ferromagnet system
ZHAO Hong-kang1, WANG Jian2
1.Department of Physics, Beijing Institute of Technology; Department of Physics and the Center of Theoretical and Computational Physics, The University of Hong Kong; 2.Department of Physics and the Center of Theoretical and Computational Physics, The University of Hong Kong
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Abstract We have investigated the shot noises of charge and spin current by considering the spin polarized electron tunneling through a ferromagnet-quantum-dot-ferromagnet system. We have derived the spin polarized current noise matrix, from which we can derive general expressions of shot noises associated with charge and spin currents. The spin and charge currents are intimately related to the polarization angles, and they behave quite differently from each other. The shot noise of charge current is symmetric about the gate voltage whose structure is modified by the Zeeman field considerably. There exists oscillations in spin current shot noise in the absence of source-drain bias at zero temperature, and it is asymmetric in the positive and negative regimes of sourcedrain voltage. The shot noise of spin current behaves quite differently from the shot noise of charge current, since the spin current components Ixs, Iys oscillate sinusoidally with the frequency ?? in the ?th lead, while the Izs component of spin current is independent of time.
Issue Date: 05 September 2008
 Cite this article:   
ZHAO Hong-kang,WANG Jian. Shot noises of spin and charge currents in a ferromagnet-quantum-dot-ferromagnet system[J]. Front. Phys. , 2008, 3(3): 280-293.
 URL:  
https://academic.hep.com.cn/fop/EN/10.1007/s11467-008-0026-y
https://academic.hep.com.cn/fop/EN/Y2008/V3/I3/280
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