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串型耦合双量子点之间库仑作用对其近藤共振的影响
The effect of the interdot Coulomb interaction on Kondo resonance in series-coupled double quantum dots
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摘要: 从理论上研究了串型耦合双量子点之间库仑作用对其近藤共振的影响．采用非平衡态格林函数和奴役玻色子平均场近似方法求解了系统的哈密顿量；计算了系统电子的态密度、透射率、占居数和近藤温度随双量子点之间库仑作用能的变化，同时也计算了电极处于极化时双量子点之间库仑作用能对系统电子态密度的影响．结果表明，双量子点之间库仑作用能够极大地影响系统的基态物理性质．同时还对相关的物理问题进行了讨论．
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关键词:
- 双量子点之间库仑作用 /
- 近藤共振 /
- 透射率 /
- 奴役玻色子平均场近似
Abstract: We theoretically investigate the effect of the interdot coulomb interaction on Kondo resonance in series-coupled double quantum dots. The Anderson Hamiltonian of our system is solved by means of the slave-boson mean-field approximation, and the variations of the density of states, the transmission probability, the occupation number and the Kondo temperature with interdot Coulomb interaction are discussed in the Kondo regime, and the densities of states are calculated in the Kondo regime for various interdot Coulomb repulsions with parallel and antiparallel lead-polarization alignments. Our results reveal that the interdot Coulomb interaction between quantum dots greatly influences the physical property of this system, and relevant underlying physics of this problem is discussed. -
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