Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases

doi:10.1088/1674-1056/ab3f98

中国物理B ›› 2019, Vol. 28 ›› Issue (10): 107305-107305.doi: 10.1088/1674-1056/ab3f98

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases

Feng Chi(迟锋), Zhen-Guo Fu(付振国), Liming Liu(刘黎明), Ping Zhang(张平)

1 School of Electronic and Information Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528400, China;
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

收稿日期:2019-07-22 修回日期:2019-08-26 出版日期:2019-10-05 发布日期:2019-10-05
通讯作者: Zhen-Guo Fu, Ping Zhang E-mail:fu_zhenguo@iapcm.ac.cn;zhang_ping@iapcm.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61274101, 51362031, and 11675023), the Innovation Development Fund of China Academy of Engineering Physics (CAEP) (Grant No. ZYCX1921-02), the Presidential Foundation of CAEP (Grant No. YZ2015014), the Initial Project of University of Electronic Science and Technology of China, Zhongshan Institute (Grant No. 415YKQ02), Science and Technology Bureau of Zhongshan, China (Grant Nos. 417S26 and 180809162197886).

Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases

Feng Chi(迟锋)¹, Zhen-Guo Fu(付振国)², Liming Liu(刘黎明)¹, Ping Zhang(张平)²

1 School of Electronic and Information Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528400, China;
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received:2019-07-22 Revised:2019-08-26 Online:2019-10-05 Published:2019-10-05
Contact: Zhen-Guo Fu, Ping Zhang E-mail:fu_zhenguo@iapcm.ac.cn;zhang_ping@iapcm.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61274101, 51362031, and 11675023), the Innovation Development Fund of China Academy of Engineering Physics (CAEP) (Grant No. ZYCX1921-02), the Presidential Foundation of CAEP (Grant No. YZ2015014), the Initial Project of University of Electronic Science and Technology of China, Zhongshan Institute (Grant No. 415YKQ02), Science and Technology Bureau of Zhongshan, China (Grant Nos. 417S26 and 180809162197886).

摘要/Abstract

摘要： We study the spin-dependent thermopower in a double-quantum-dot (DQD) embedded between the left and right two-dimensional electron gases (2DEGs) in doped quantum wells under an in-plane magnetic field. When the separation between the DQD is smaller than the Fermi wavelength in the 2DEGs, the asymmetry in the dots' energy levels leads to pronounced quantum interference effects characterized by the Dicke line-shape of the conductance, which are sensitive to the properties of the 2DEGs. The magnitude of the thermopower, which denotes the generated voltage in response to an infinitesimal temperature difference between the two 2DEGs under vanishing charge current, will be obviously enhanced by the Dicke effect. The application of the in-plane magnetic field results in the polarization of the spin-up and spin-down conductances and thermopowers, and enables an efficient spin-filter device in addition to a tunable pure spin thermopower in the absence of its charge counterpart.

关键词: quantum dot, spin-dependent thermopower, two-dimensional electron gases

Abstract: We study the spin-dependent thermopower in a double-quantum-dot (DQD) embedded between the left and right two-dimensional electron gases (2DEGs) in doped quantum wells under an in-plane magnetic field. When the separation between the DQD is smaller than the Fermi wavelength in the 2DEGs, the asymmetry in the dots' energy levels leads to pronounced quantum interference effects characterized by the Dicke line-shape of the conductance, which are sensitive to the properties of the 2DEGs. The magnitude of the thermopower, which denotes the generated voltage in response to an infinitesimal temperature difference between the two 2DEGs under vanishing charge current, will be obviously enhanced by the Dicke effect. The application of the in-plane magnetic field results in the polarization of the spin-up and spin-down conductances and thermopowers, and enables an efficient spin-filter device in addition to a tunable pure spin thermopower in the absence of its charge counterpart.

Key words: quantum dot, spin-dependent thermopower, two-dimensional electron gases

中图分类号: (Quantum dots)

73.21.La

72.15.Jf (Thermoelectric and thermomagnetic effects) 73.50.Lw (Thermoelectric effects)

迟锋, 付振国, 刘黎明, 张平. Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases[J]. 中国物理B, 2019, 28(10): 107305-107305.

Feng Chi(迟锋), Zhen-Guo Fu(付振国), Liming Liu(刘黎明), Ping Zhang(张平). Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases[J]. Chin. Phys. B, 2019, 28(10): 107305-107305.

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Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases

Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases

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