Spin-Polarized Electron Tunneling TD:\pdf\.PDFhrough a Quantum Dot |
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Authors: | LU Yu SUN QingFeng LIN TsungHan |
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Institution: | 1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China;
2. Institute of Theoretical Physics, Academia Sinica, Beijing 100080, China |
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Abstract: | Nonequilibrium Green's function is uscd to study spin-polarized electron tunneling through a quantum dot connected to two ferromagnetic electrodes with different orientations via two insulating barriers (FM/I/QD/I/FA.f). Intra-level Coulomb interaction in the dot is considered. General formula of tunneling current which can be used for arbitrary angle between the two electrodes' magnetizations is derived for both the weak and strong intra-dot interactions.We find that the transport current can be divided into two parts: the current with the spin-flip and the current without the spin-flip, which critically depend on the linewidth function near the Fermi level of the ferromagnetic electrodes. If a magnetic field is applied in the quantum dot, different behaviors will be found for weak and strong interactions. |
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Keywords: | mesoscopic transport spin-polarized electrons quantum dot |
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