Emergent Electric Polarization by Kondo Effect in a Triangular Triple Quantum Dot

被引：10

作者：

Koga, Mikito ^{[1
]}

Matsumoto, Masashige ^{[2
]}

Kusunose, Hiroaki ^{[3
]}

机构：

[1] Shizuoka Univ, Fac Educ, Dept Phys, Shizuoka 4228529, Japan

[2] Shizuoka Univ, Fac Sci, Dept Phys, Shizuoka 4228529, Japan

[3] Ehime Univ, Dept Phys, Matsuyama, Ehime 7908577, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2012年 / 81卷 / 12期

基金：

日本学术振兴会;

关键词：

Kondo effect; quantum dot; electric polarization; numerical renormalization group; RENORMALIZATION-GROUP; SPIN;

D O I：

10.1143/JPSJ.81.123703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A triangular triple quantum dot gives various Kondo effects, such as the emergence of an electric polarization accompanied by a complete compensation of spin degrees of freedom. The interplay of spin and charge of electrons in quantum dots is investigated using an Anderson model with an equilateral triangular spin cluster, in which a single electron state at one site is hybridized with a conduction band in a lead. The numerical renormalization group analysis shows how a nonzero electric polarization develops with local electrons traveling in the loop and how it depends on the hybridization strength as an experimentally controllable parameter in the Kondo effect.

引用

页数：4

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