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篇目详细内容 |
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【篇名】 |
Shot noises of spin and charge currents in a ferromagnet-quantum-dot-ferromagnet system |
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【刊名】 |
Frontiers of Physics in China |
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【刊名缩写】 |
Front. Phys. China |
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【ISSN】 |
1673-3487 |
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【EISSN】 |
1673-3606 |
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【DOI】 |
10.1007/s11467-008-0026-y |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2008 |
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【卷期】 |
3
卷3期 |
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【页码】 |
280-293
页,共
14
页 |
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【作者】 |
ZHAO Hong-kang;
WANG Jian;
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【关键词】 |
shot noise; current correlation; mesoscopic system; quantum dot |
【摘要】 |
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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 蠅纬 in the 纬th lead, while the Izs component of spin current is independent of time. |
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