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Large Seebeck coefficient resulting from chiral interactions in triangular triple quantum dots |
| Yi-Ming Liu(刘一铭) and Jian-Hua Wei(魏建华)† |
| Department of Physics, Renmin University of China, Beijing 100872, China |
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Abstract We theoretically study thermoelectric transport properties through a triangular triple-quantum-dot (TTQD) structure in the linear response regime using the hierarchical equations of motion approach. It is demonstrated that large Seebeck coefficient can be obtained when properly matching the interdot tunneling strength and magnetic flux at the electron-hole symmetry point, as a result of spin chiral interactions in the TTQD system. We present a systematic investigation of the thermopower (the Seebeck coefficient) dependence on the tunneling strength, magnetic flux, and on-site energy. The Seebeck coefficient shows a clear breakdown of electron-hole symmetry in the vicinity of the Kondo regime, accompanied by the deviation from the semiclassical Mott relation in the Kondo and mixed-valence regimes, which result from the many-body effects of the Kondo correlated induced resonance together with spin chiral interactions.
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Received: 04 March 2022
Revised: 22 April 2022
Accepted manuscript online: 07 May 2022
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PACS:
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73.21.La
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(Quantum dots)
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418, 11374363, and 21373191). |
Corresponding Authors:
Jian-Hua Wei
E-mail: wjh@ruc.edu.cn
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Cite this article:
Yi-Ming Liu(刘一铭) and Jian-Hua Wei(魏建华) Large Seebeck coefficient resulting from chiral interactions in triangular triple quantum dots 2022 Chin. Phys. B 31 097201
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