Abstract
With the help of the Green function technique and the equation of motion approach, we study the thermoelectric efficiency (characterized by the figure of merit) in parallel-coupled double quantum dots (QDs) system. It is found that the configurations of the dot-lead coupling strengths exert a significant impact on the figure of merit through the Fano effect, due to which electrons experience an abrupt change from resonant to antiresonant tunneling. The absolute value of the thermopower is increased by the Fano resonance and antiresonance, while the electrical conductance is separately enhanced and suppressed, leading to the enhancement of the thermal efficiency of the device.
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