Spin-dependent thermoelectric transport through double quantum dots

doi:10.1088/1674-1056/21/11/117310

中国物理B ›› 2012, Vol. 21 ›› Issue (11): 117310-117310.doi: 10.1088/1674-1056/21/11/117310

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

Spin-dependent thermoelectric transport through double quantum dots

王强^a, 解海卿^a, 焦虎军^a, 李志坚^a, 聂一行^{a b}

a Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China;
b Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China

收稿日期:2012-04-07 修回日期:2012-05-21 出版日期:2012-10-01 发布日期:2012-10-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11274208，10974124, and 11004124) and the Shanxi Natural Science Foundation, China (Grant No. 2009011001-1).

Spin-dependent thermoelectric transport through double quantum dots

Wang Qiang (王强)^a, Xie Hai-Qing (解海卿)^a, Jiao Hu-Jun (焦虎军)^a, Li Zhi-Jian (李志坚)^a, Nie Yi-Hang (聂一行 )^{a b}

a Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China;
b Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China

Received:2012-04-07 Revised:2012-05-21 Online:2012-10-01 Published:2012-10-01
Contact: Nie Yi-Hang E-mail:nieyh@sxu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11274208，10974124, and 11004124) and the Shanxi Natural Science Foundation, China (Grant No. 2009011001-1).

摘要/Abstract

摘要： We study the thermoelectric transport through a double-quantum-dot system with spin-dependent interdot coupling and ferromagnetic electrodes by means of the non-equilibrium Green's function in the linear response regime. It is found that the thermoelectric coefficients are strongly dependent on the splitting of the interdot coupling, the relative magnetic configurations, and the spin polarization of leads. In particular, the thermoelectric efficiency can reach a considerable value in the parallel configuration when the effective interdot coupling and the tunnel coupling between the quantum dots and the leads for the spin-down electrons are small. Moreover, the thermoelectric efficiency increases with the intradot Coulomb interaction increasing and can reach very high values at appropriate temperatures. In the presence of the magnetic field, the spin accumulation in the leads strongly suppresses the thermoelectric efficiency, and a pure spin thermopower can be obtained.

关键词: thermoelectric effect, double quantum dots, spin effect

Abstract: We study the thermoelectric transport through a double-quantum-dot system with spin-dependent interdot coupling and ferromagnetic electrodes by means of the non-equilibrium Green's function in the linear response regime. It is found that the thermoelectric coefficients are strongly dependent on the splitting of the interdot coupling, the relative magnetic configurations, and the spin polarization of leads. In particular, the thermoelectric efficiency can reach a considerable value in the parallel configuration when the effective interdot coupling and the tunnel coupling between the quantum dots and the leads for the spin-down electrons are small. Moreover, the thermoelectric efficiency increases with the intradot Coulomb interaction increasing and can reach very high values at appropriate temperatures. In the presence of the magnetic field, the spin accumulation in the leads strongly suppresses the thermoelectric efficiency, and a pure spin thermopower can be obtained.

Key words: thermoelectric effect, double quantum dots, spin effect

中图分类号: (Thermoelectric effects)

73.50.Lw

65.80.-g (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems) 85.80.Lp (Magnetothermal devices) 73.63.Kv (Quantum dots)

王强, 解海卿, 焦虎军, 李志坚, 聂一行 . Spin-dependent thermoelectric transport through double quantum dots[J]. 中国物理B, 2012, 21(11): 117310-117310.

Wang Qiang (王强), Xie Hai-Qing (解海卿), Jiao Hu-Jun (焦虎军), Li Zhi-Jian (李志坚), Nie Yi-Hang (聂一行 ). Spin-dependent thermoelectric transport through double quantum dots[J]. Chin. Phys. B, 2012, 21(11): 117310-117310.

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Spin-dependent thermoelectric transport through double quantum dots

Spin-dependent thermoelectric transport through double quantum dots

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