Heat transport and thermoelectric efficiency of two-level quantum dot attached to ferromagnetic electrodes

M. Wierzbicki , Renata Świrkowicz

Abstract

Energy transport, in the linear response regime, through a two-level quantum dot/molecule attached to ferromagnetic leads is studied in the Coulomb blockade region with use of the Green function formalism. Thermal conductance and figure of merit ZT are calculated and discussed for two configurations of magnetic moments and different polarization factor in the leads. A strong dependence of ZT on polarization is found. A substantial enhancement of efficiency can be observed in molecular junctions with one of energy levels weakly coupled to the leads. Moreover, in systems, in which spin accumulation in electrodes is important, a quite considerable spin efficiency can be expected.
Author M. Wierzbicki
M. Wierzbicki,,
-
, Renata Świrkowicz ZBS
Renata Świrkowicz,,
- Structural Research Division
Journal seriesPhysics Letters A, ISSN 0375-9601
Issue year2011
Vol375
No3
Pages609-613
Keywords in EnglishFigure of merit, Quantum dots, Spin effects, Thermal conductance
DOIDOI:10.1016/j.physleta.2010.11.023
URL http://www.sciencedirect.com/science/article/pii/S0375960110014714
Score (nominal)35
Publication indicators WoS Impact Factor: 2011 = 1.632 (2) - 2011=1.731 (5)
Citation count*12 (2015-02-04)
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