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Colossal enhancement in thermoelectric efficiency of weakly coupled double quantum dot system

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2 Author(s)
Rajput, Gagan ; Department of Physics, Himachal Pradesh University, Shimla Summerhill—Shimla, Himachal Pradesh 171005, India ; Sharma, K.C.

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A colossal enhancement in thermoelectric efficiency, ZT, of coupled double quantum dot (DQD) system in series configuration, have been predicted in the Coulomb blockade regime for a non-magnetic case, as a result of very weak interdot tunnel coupling and highly asymmetric dot-lead couplings using Keldysh nonequilibrium Green function approach. Such an enhancement (which leads to saturation in the extreme case) of ZT as a result of tuning of coupling parameters is understood in terms of bipolar effect. These findings suggest that highly asymmetric DQD system, with very weak interdot tunnel coupling can be used to design more efficient thermoelectric devices.

Published in:

Journal of Applied Physics  (Volume:110 ,  Issue: 11 )

Date of Publication:

Dec 2011

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