| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 103 === In the thesis, combined the extened Hubbard and Anderson models to illustrate
the effect of long-distance coherent tunneling(LDCT) on charge and heat currents in
serially coupled tripled quantum dots(SCTQDs) connected to left and right electrodes.
The transmisssion coefficient of quantum dots in columb blockage regime can be
calculated by Keldysh-Green’s function technique. The physical parameters including
electron Coulomb interactions, electron hopping strengths, and bias-dependent
quantum dot energy levels are calculated in the framework of effective mass theory
for semiconductor TQDs. The interdot coupling strength decreases exponentially with
the separation between QDs. Therefore, the charge and heat currents will become
insignificant. If embedded another QD in the middle of two QDs, the effect of LDCT
on the coherent of outside QDs can be robust. It’s possible to change the transmission
characteristics by tuning the energy level of the middle QD. In addition, it is shown
that prominent heat rectification behavior can exist in the TQD system with
asymmetrical energy levels.
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