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Enhancing thermodynamic performances and suppressing fluctuations in interacting quantum-dot thermoelectric engines |
| Jianhan Zhuang(庄剑涵)1,2, Qinyan Zou(邹沁研)1,2, Ziming Wang(王子明)1,2, Gaoyuan Chen(陈高远)1,2, Jian Sun(孙坚)1,2, Xiang Hao(郝翔)1,2, Chen Wang(王晨)3,†, and Jincheng Lu(陆金成)1,2,‡ |
1 Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China;
2 Advanced Technology Research Institute of Taihu Photon Center, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China;
3 Department of Physics, Zhejiang Normal University, Jinhua 321004, China |
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Abstract Quantum dot systems emerge as promising platforms for studying nanoscale thermoelectric effects and quantum fluctuation phenomena. In this work, we investigate the thermodynamic performance of a Coulomb-blockaded quantum dot operating as a quantum heat engine using the quantum master equation approach. By incorporating full counting statistics, we analyze both average transport properties and current fluctuations in this nanoscale system. We demonstrate that electron-electron interactions significantly enhance thermoelectric performance by increasing both the output power and energy conversion efficiency. Furthermore, we show that Coulomb interactions suppress current fluctuations while preserving the validity of the thermodynamic uncertainty relation. Our results provide important insights into the interplay between quantum effects and thermodynamic principles in nanoscale heat engines.
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Received: 08 September 2025
Revised: 10 October 2025
Accepted manuscript online: 14 October 2025
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PACS:
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05.70.Ln
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(Nonequilibrium and irreversible thermodynamics)
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05.40.Ca
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(Noise)
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73.23.Hk
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(Coulomb blockade; single-electron tunneling)
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73.50.Lw
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(Thermoelectric effects)
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84.60.Rb
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(Thermoelectric, electrogasdynamic and other direct energy conversion)
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| Fund: This project was supported by the National Natural Science Foundation of China (Grant No. 12305050), the Natural Science Foundation of Jiangsu Higher Education Institutions of China (Grant No. 23KJB140017), and the Zhejiang Provincial Natural Science Foundation of China (Grant No. LZ25A050001). |
Corresponding Authors:
Chen Wang, Jincheng Lu
E-mail: wangchen@zjnu.cn;jinchenglu@usts.edu.cn
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Cite this article:
Jianhan Zhuang(庄剑涵), Qinyan Zou(邹沁研), Ziming Wang(王子明), Gaoyuan Chen(陈高远), Jian Sun(孙坚), Xiang Hao(郝翔), Chen Wang(王晨), and Jincheng Lu(陆金成) Enhancing thermodynamic performances and suppressing fluctuations in interacting quantum-dot thermoelectric engines 2026 Chin. Phys. B 35 010508
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