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首页> 外文期刊>Physical review >Electron transport through a quantum dot in the Coulomb blockade regime: Nonequilibrium Green's function based model
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Electron transport through a quantum dot in the Coulomb blockade regime: Nonequilibrium Green's function based model

机译：电子在库仑阻滞体系中通过量子点的传输：基于非格林函数的模型

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摘要

We explore electron transport through a quantum dot coupled to the source and drain charge reservoirs. We trace the transition from the Coulomb blockade regime to Kondo regime in the electron transport through the dot occurring when we gradually strengthen the coupling of the dot to the charge reservoirs. The current-voltage (Ⅰ-Ⅴ) characteristics are calculated using the equations of motion approach within the nonequilibrium Green's function formalism beyond the Hartree-Fock approximation. We show that within the Coulomb blockade regime the Ⅰ-Ⅴ characteristics for the quantum dot containing a single spin-degenerated level with the energy E_0 include two steps whose locations are determined by the values of E_0 and the energy of Coulomb interaction of electrons in the dot U. The heights of the steps are related as 2:1 which is consistent with the results obtained by means of the transition rate equations.
机译：我们探索通过耦合到源极和漏极电荷库的量子点的电子传输。当我们逐渐加强点与电荷储集层的耦合时，我们通过点发生电子传输，从而追踪了从库仑阻滞状态到近藤状态的过渡。使用Hartree-Fock逼近以外的非平衡格林函数形式中的运动方法方程来计算电流-电压（Ⅰ-Ⅴ）特性。我们发现，在库仑封锁体系中，具有单个自旋简并能级为E_0的量子点的Ⅰ-Ⅴ特性包括两个步骤，其位置由E_0的值和电子在库仑相互作用时的能量决定。点U。台阶的高度与2：1相关，这与通过过渡速率方程获得的结果一致。

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