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Enhanced Spin Seebeck Efficiency in Closed Triple Quantum Dots Ring with Spin-Dependent Interdot Couplings

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Abstract

Spin Seebeck effect (SSE) in triple quantum dots coupled to ferromagnetic leads is studied by using the Keldysh nonequilibrium Green’s function technique. In low temperature regimes, the Fano effect arising from the interferences between the isolated states and the continuum plays an dominant role in the electronic and thermoelectric transport processes. The Seebeck coefficient depends on spin degree of freedom when the leads’ magnetic moments are in parallel configuration. When the leads’ polarization is varied, the charge Seebeck coefficients are less influenced, whereas those of the spin counterparts are obviously changed. The magnitudes of both the SSE coefficient and the spin figure of merit (FOM) will be enhanced by increasing the asymmetry of the leads’ spin polarization. In the presence of the spin-dependent interdot couplings, the strengths of the charge and spin thermoelectric quantities are individually suppressed and enhanced, and then the magnitudes of the SSE coefficient and the spin FOM are comparable to those of the charge counterparts. Interestingly, by the joint effects of the ferromagnetism on the leads and the spin-dependent interdot couplings, the spin thermopower can even changes its sign around the antiresonance states.

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Acknowledgments

This work is supported by the NSFC (Grant Nos. 61274101 and 51362031), and the Initial Project of UEST of China, Zhongshan Institute (415YKQ02). This work is also supported by the Innovation Team of Zhongshan City (No. 170615151170710).

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Authors and Affiliations

  1. State Key Laboratory of Electronic Thin Films and Integrated Device, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Shu-Chao Yu & Hongwei Chen

  2. School of Electronic and Information Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan, 528400, China

    Shu-Chao Yu, Feng Chi & Li-Ming Liu

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  1. Shu-Chao Yu
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  2. Feng Chi
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Correspondence to Feng Chi.

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Yu, SC., Chi, F., Liu, LM. et al. Enhanced Spin Seebeck Efficiency in Closed Triple Quantum Dots Ring with Spin-Dependent Interdot Couplings. Int J Theor Phys 58, 2757–2769 (2019). https://doi.org/10.1007/s10773-019-04106-7

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