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Andreev Tunneling Through a Ferromagnet/Quantum-Dot/Superconductor System
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作者 rao hong-hu zhu yu lin tsung-han 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第11期629-633,共5页
We study Andreev tunneling through a ferromagnet/quantum-dot (QD)/superconductor system. By usingnonequilibrum Green function method, the averaged occupation of electrons in QD and the Andreev tunneling currentare stu... We study Andreev tunneling through a ferromagnet/quantum-dot (QD)/superconductor system. By usingnonequilibrum Green function method, the averaged occupation of electrons in QD and the Andreev tunneling currentare studied. Comparing to the norma-metal/quantum-dot/superconductor, the system shows significant changes: (i)The averaged occupations of spin-up and spin-down electrons are not equal. (ii) With the increase of the polarizationof ferromagnetic lead, the Andreev reflection current decreases. (iii) However, even the ferromagnetic lead reaches fullpolarization, the averaged occupation of spin-down electrons is not zero. The physics of these changes is discussed. 展开更多
关键词 ANDREEV tunneling ferromagnet/quantum-dot/superconductor SYSTEM
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