Thermal spin current through a double quantum dot molecular junction in the Coulomb blockade regime

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[1] [1,Hong, X.K.
[2] Liu, Y.S.
[3] Feng, J.F.
[4] Chu, J.H.
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| 1600年 / American Institute of Physics Inc.卷 / 114期
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Based on non-equilibrium Green's function methods; we investigate the thermal spin current through a double quantum dot (DQD) molecular junction in the Coulomb blockade regime. An external magnetic field and a temperature difference are utilized to manipulate the electron spin degree of freedom in the DQD device. When the chemical potentials are aligned with the electron-hole symmetry point; a very steady pure-spin-current thermal generator is achieved. This is because the transmission nodes of different spin channels relative to chemical potentials have a perfect mirror symmetry configuration. In addition; the pure spin current also appears near resonant regions induced by the molecular states. Particularly interesting is that the sign of the pure spin current in the electron-hole symmetry point is opposite to those appearing near resonant regions in the strong Coulomb interaction regime. © 2013 AIP Publishing LLC;
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