On the competition between the Kondo effect and the exchange interaction in a parallel double quantum dot system

被引：1

作者：

Ding, Guo-Hui ^{[1
]}

Ye, Fei ^{[2
]}

Wang, Xiaoqun ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Minist Educ, Key Lab Artificial Struct & Quantum Control, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

[2] South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2019年 / 31卷 / 27期

基金：

中国国家自然科学基金;

关键词：

quantum dot; Kondo effect; effective action theory; CONSERVING APPROXIMATIONS; ELECTRONIC TRANSPORT; RESONANCES;

D O I：

10.1088/1361-648X/ab138a

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the competition between the Kondo effect and the exchange interaction in the parallel double quantum dot (DQD) system within an effective action field theory. The strong on-site Coulomb interactions in DQD5 are treated by using the Hubbard-Stratonovich transformation and the introduction of scalar potential fields. We show that a self-consistent perturbation approach, which takes into account the statistical properties of the potential fields acting on electrons in DQD5, describes well the crossover from the Kondo regime to the spin-singlet state in this system. The linear conductance and the intradot/interdot spin excitation spectra of this system are obtained.

引用

页数：7

共 40 条

[1] SELF-CONSISTENT APPROXIMATIONS IN MANY-BODY SYSTEMS [J].