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arXiv 0705.4537cond-mat.str-el
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侧面耦合量子点中的关联效应

Correlation Effects in Side-Coupled Quantum Dots

Rok Zitko Janez Bonca

摘要:

利用Wilson数值重整化群(NRG)方法计算了双量子点(DQD)系统的零偏压电导和各种关联函数。我们提出了不同的制度内的DQD系统的相图。通过在量子点上引入一个负的Hubbard U,我们模拟了电子-声子耦合效应,并研究了自旋和电荷共存的近藤态的性质。在三量子点系统中,量子点上的局域化矩在指数型不同的近藤温度下连续地被屏蔽,从而出现多级近藤效应。

英文摘要:

Using Wilson's numerical renormalization group (NRG) technique we compute zero-bias conductance and various correlation functions of a double quantum dot (DQD) system. We present different regimes within a phase diagram of the DQD system. By introducing a negative Hubbard U on one of the quantum dots, we simulate the effect of electron-phonon coupling and explore the properties of the coexisting spin and charge Kondo state. In a triple quantum dot (TQD) system a multi-stage Kondo effect appears where localized moments on quantum dots are screened successively at exponentially distinct Kondo temperatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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