Spin Thermoelectric Effects in a Three-Terminal Double-Dot Interferometer |
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Authors: | Feng Liang Ben-Ling Gao Guang Song Yu Gu |
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Institution: | 1. Department of Applied Physics, Huaiyin Institute of Technology, Huaian 223003, China;
2. Department of Physics and Siyuan Laboratory, Jinan University, Guangzhou 510632, China |
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Abstract: | We theoretically investigate the thermoelectric properties of a three-terminal double-dot interferometer with Rashba spin-orbit interaction. It is found that with some temperature distributions a thermal spin current can even be produced without the help of magnetic flux and by tuning the spin interference effect in the system, a pure spin or fully spin-polarized current can be driven by temperature differences. For the cases that two of the terminals are held at the same temperature, the charge (spin) thermopower and the charge (spin) figure of merit are defined and calculated in the linear response regime. With some choices of the system parameters the calculated spin and charge thermopowers are of the same order of magnitude and the charge figure of merit can exceed 1. |
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Keywords: | thermoelectric effects thermal spin current Rashba spin-orbit interaction interferometer nonequilibrium Green's function method |
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