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

Ding, Guo-Hui1; Ye, Fei2; Wang, Xiaoqun1

2019-07-10

10.1088/1361-648X/ab138a

JOURNAL OF PHYSICS-CONDENSED MATTER   影响因子和分区

0953-8984

1361-648X

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.

quantum dot Kondo effect effective action theory

SCI ; EI

英语

通讯

Science Technology and Innovation Commission of Shenzhen Municipality[JCYJ20160531190535310]

Physics

Physics, Condensed Matter

WOS:000465979500001

IOP PUBLISHING LTD

20192707131782

Exchange interactions ; Kondo effect ; Nanocrystals

Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Atomic and Molecular Physics:931.3 ; Solid State Physics:933

PHYSICS

Web of Science

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

Ding, Guo-Hui,Ye, Fei,Wang, Xiaoqun. On the competition between the Kondo effect and the exchange interaction in a parallel double quantum dot system[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2019,31(27).

Ding, Guo-Hui,Ye, Fei,&Wang, Xiaoqun.(2019).On the competition between the Kondo effect and the exchange interaction in a parallel double quantum dot system.JOURNAL OF PHYSICS-CONDENSED MATTER,31(27).

Ding, Guo-Hui,et al."On the competition between the Kondo effect and the exchange interaction in a parallel double quantum dot system".JOURNAL OF PHYSICS-CONDENSED MATTER 31.27(2019).