Enhancement of Kondo effect in quantum dots with an even number of electrons

被引：123

作者：

Eto, M

Nazarov, YV

机构：

[1] Delft Univ Technol, Dept Appl Phys, DIMES, NL-2628 CJ Delft, Netherlands

[2] Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.85.1306

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the Kondo effect in a quantum dot with almost degenerate spin-singlet and triplet stares for an even number of electrons. We show that the Kondo temperature as a function of the energy difference between the states a reaches its maximum around Delta = 0 and decreases with increasing Delta. The Kondo effect is thus enhanced by competition between singlet and triplet states. Our results explain recent experimental findings. We evaluate the linear conductance in the perturbative regime.

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页码：1306 / 1309

页数：4

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