Josephson Effect in a T-Shaped Triple-Quantum-Dot Structure: π-Junction Behavior and Two-Stage Kondo Effect

被引：1

作者：

Zhong, Su-Rui ^{[1
]}

Jin, Li-Hui ^{[2
]}

Yang, Chuan-Jing ^{[3
]}

Li, Xue-Si ^{[1
]}

Yi, Guang-Yu ^{[1
]}

机构：

[1] Northeastern Univ, Coll Sci, Shenyang 110819, Liaoning, Peoples R China

[2] Yantai Engn & Technol Coll, Dept Elect & New Energy Engn, Yantai 264006, Peoples R China

[3] Henan Univ Sci & Technol, Coll Phys & Engn, Luoyang 471023, Peoples R China

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2020年 / 257卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Josephson effect; phase transitions; quantum dots; two-stage Kondo effect; SUPERCONDUCTORS;

D O I：

10.1002/pssb.201900568

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

By means of the exact diagonalization approach, the interplay between the Josephson effect and the two-stage Kondo physics in a T-shaped triple-quantum-dot (TQD) junction is theoretically investigated. It is found that by adjusting the interdot couplings, the Josephson current exhibits the rich 0-pi transition behaviors. These results originate from the mutual competition and cooperation of Cooper-pair correlation and two-stage Kondo correlation in the system. Moreover, due to the occurrence of two-stage Kondo effect, the Josephson phase transition can be adjusted in a precise manner. It is believed that this work can help to understand the supercurrent phase transition in the QD-based Josephson junctions.

引用

页数：6

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