Thermopower and thermal conductance through parallel coupled quantum dots

被引：0
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作者：
Franco, R. [1 ,2 ]
Silva-Valencia, J. [1 ]
Figueira, M.S. [2 ]
机构：
[1] Departamento de Física, Universidad Nacional de Colombia, UNAL, A. A. 5997 Bogotá, Colombia
[2] Instituto de Física, Universidade Federal Fluminense, UFF, Av. Litorânea s/no Niterói, 24210-340 Rio de Janeiro, Brazil
来源：
Journal of Applied Physics | 2008年 / 103卷 / 07期
关键词：
We study the thermoelectric transport properties through two parallel coupled; gate-defined quantum dots (QDs); in the framework of the X-boson treatment for the impurity Anderson model. We compute the thermopower S; the thermal conductance κ; the electrical conductance G; and the product of the thermoelectric figure of merit and the temperature ZT; as function of the dot energy. We concentrate the calculations on ZT; that is; a measure of the usefulness of materials or devices as thermopower generators or cooling systems. If the coupling between the QDs is weak; ZT is greater than 1 when TΔ (Δ is the mixing width between the QD and the leads) but when the system is coupled; the second dot can tune the temperature region where ZT>1. This result increases the possibilities of practical application of the system in mesoscopic cooling process. © 2008 American Institute of Physics;
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