Long-distance coherent tunneling effect on the charge and heat currents in serially coupled triple quantum dots

• Main Authors: Shu-yuan Hsu, 許淑媛
• Other Authors: Ming-ting Kuo
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/08640565821185563213

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.