Kondo Effect in Electron Tunneling through Quantum Dots-Study with Quantum Monte Carlo Method-
Kondo Effect in Electron Tunneling through Quantum Dots-Study with Quantum Monte Carlo Method-
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量子点电子隧道中的近藤效应-量子蒙特卡罗方法研究-
DOI：
10.1143/jpsj.68.1640
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发表时间：
1999
影响因子：
1.7
通讯作者：
A. Oguri
中科院分区：
文献类型：
--
作者：
O. Sakai;Shunya Suzuki;W. Izumida;A. Oguri
基于量子蒙特卡罗（QMC）技术，我们发展了一种计算量子点系统隧穿电导的方法，其中近藤效应是量子点系统隧穿电导的重要因素。该方法直接由电流关联函数计算电导，适用于非单粒子绿色函数计算的情况。我们比较计算的电导与实验，并发现良好的定性协议。与两个成对库仑振荡峰中间区域的近藤温度相比，实验中的温度似乎不够低。我们研究了塞曼场效应，并表明，电导被强烈抑制时，它已被增强的近藤效应。还研究了含点的Aharonov-Bhom电路的电导。
Based on the Quantum Monte Carlo (QMC) technique, we developed a method to calculate the tunneling conductance of the quantum dot systems for which the Kondo effect becomes important. The method computes the conductance directly from the current correlation function, and is applicable to the cases in which the calculation is not reduced to the computation of single particle Green's function. We compare the calculated conductance with experiments, and found good qualitative agreement. The temperature in experiments seems to be not low enough compared with the Kondo temperature in the mid region of the two paired Coulomb oscillation peaks. We studied the Zeeman field effect, and showed that the conductance is strongly suppressed when it has been enhanced by the Kondo effect. The conductance of an Aharonov-Bhom circuit including dots was also studied.