Spin-dependent thermoelectric transport through double quantum dots

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

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.

Keywords: thermoelectric effect double quantum dots spin effect

Received: 07 April 2012
Revised: 21 May 2012
Accepted manuscript online:

PACS:	73.50.Lw	(Thermoelectric effects)
	65.80.-g	(Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)
	85.80.Lp	(Magnetothermal devices)
	73.63.Kv	(Quantum dots)

Fund: 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).

Corresponding Authors: Nie Yi-Hang
E-mail: nieyh@sxu.edu.cn

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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 2012 Chin. Phys. B 21 117310

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