Quantum phase transition and underscreened Kondo effect in electron transport through parallel double quantum dots

被引：11

作者：

Ding, Guo-Hui ^{[1
]}

Ye, Fei ^{[2
]}

Dong, Bing ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China

[2] Tsinghua Univ, Ctr Adv Study, Beijing 100084, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2009年 / 21卷 / 45期

基金：

中国国家自然科学基金;

关键词：

RENORMALIZATION-GROUP APPROACH; DILUTE MAGNETIC-ALLOYS; ANDERSON MODEL; STATIC PROPERTIES;

D O I：

10.1088/0953-8984/21/45/455303

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate electronic transport through a parallel double quantum dot (DQD) system with strong on-site Coulomb interaction and capacitive interdot coupling. By applying the numerical renormalization group (NRG) method, the ground state of the system and the transmission probability at zero temperature have been obtained. For a system of quantum dots with degenerate energy levels and small interdot tunnel coupling, the spin correlations between the DQDs is ferromagnetic and the ground state of the system is a spin-1 triplet state. The linear conductance will reach the unitary limit (2e(2)/h) due to the underscreened Kondo effect at low temperature. As the interdot tunnel coupling increases, there is a quantum phase transition from ferromagnetic to antiferromagnetic spin correlation in DQDs and the linear conductance is strongly suppressed.

引用

页数：6

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