Conduction through a quantum dot near a singlet-triplet transition.
Conduction through a quantum dot near a singlet-triplet transition.
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DOI：
10.1103/physrevlett.85.2993
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发表时间：
2000-05
影响因子：
8.6
通讯作者：
M. Pustilnik;L. Glazman
中科院分区：
文献类型：
--
作者：
M. Pustilnik;L. Glazman
研究了垂直量子点中单态-三态跃迁附近的近藤效应。该系统被显示为映射到双杂质近藤模型的特殊版本。在控制参数的任何值下，系统都处于费米液体基态。得到了线性电导作为控制参数和温度T的函数的显式表达式。在T=0时，电导在相变的三重线侧达到约4e(2)/h的么正极限，并在单线态侧随着到相变距离的增加而减小。在有限温度下，电导在相变点附近出现一个峰值。
Kondo effect in the vicinity of a singlet-triplet transition in a vertical quantum dot is considered. This system is shown to map onto a special version of the two-impurity Kondo model. At any value of the control parameter, the system has a Fermi-liquid ground state. Explicit expressions for the linear conductance as a function of the control parameter and temperature T are obtained. At T = 0, the conductance reaches the unitary limit approximately 4e(2)/h at the triplet side of the transition, and decreases with the increasing distance to the transition at the singlet side. At finite temperature, the conductance exhibits a peak near the transition point.