Thermally driven pure spin current through an interacting quantum dot |
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Institution: | 1. School of Physics and Electronics, Qiannan Normal University for Nationalities, Duyun, Guizhou 558000, China;2. State Key Laboratory of Surface Physics and Key Laboratory for Computational Physical Sciences (MOE) and Department of Physics, Fudan University, Shanghai 200433, China;3. Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China |
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Abstract: | We study spin-dependent electron transport properties of a thermally driven interacting quantum dot. When an external magnetic field is applied to the quantum dot, the effective transmissions of spin-up and spin-down electrons are separated from each other and have a perfect mirror symmetry with respect to the incident energy at a certain gate voltage. A pure spin current can be induced in the system and modulated by a magnetic field. Under certain magnetic field strengths, a larger pure spin current can be obtained at gate voltages with the values in a range, not just at a specific voltage. These results indicate that the system can be worked as a pure spin current generator. |
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Keywords: | Quantum dot Spin current Magnetic field |
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