Large Seebeck coefficient resulting from chiral interactions in triangular triple quantum dots

doi:10.1088/1674-1056/ac6dae

中国物理B ›› 2022, Vol. 31 ›› Issue (9): 97201-097201.doi: 10.1088/1674-1056/ac6dae

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

收稿日期:2022-03-04 修回日期:2022-04-22 接受日期:2022-05-07 出版日期:2022-08-19 发布日期:2022-08-19
通讯作者: Jian-Hua Wei E-mail:wjh@ruc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418, 11374363, and 21373191).

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

Received:2022-03-04 Revised:2022-04-22 Accepted:2022-05-07 Online:2022-08-19 Published:2022-08-19
Contact: Jian-Hua Wei E-mail:wjh@ruc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418, 11374363, and 21373191).

摘要/Abstract

摘要： 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.

关键词: quantum dots, Seebeck coefficient, thermoelectric transport

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.

Key words: quantum dots, Seebeck coefficient, thermoelectric transport

中图分类号: (Quantum dots)

73.21.La

72.15.Jf (Thermoelectric and thermomagnetic effects)

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[J]. 中国物理B, 2022, 31(9): 97201-097201.

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[J]. Chin. Phys. B, 2022, 31(9): 97201-097201.

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Large Seebeck coefficient resulting from chiral interactions in triangular triple quantum dots

Large Seebeck coefficient resulting from chiral interactions in triangular triple quantum dots

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