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.
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页数：6
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