发表机构
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University; Department of Physics, Southern University of Science and Technology（上海交通大学物理与天文学院人工结构与量子控制教育部重点实验室; 南方科技大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究采用变分波函数方法，探究嵌入量子点的超导环的基态性质，揭示混合价态量子点下系统基态的单重态-双重态跃迁，以及超电流随磁通量振荡且在相变点突变的特性。
AI 中文摘要
我们采用变分波函数方法研究嵌入量子点（QD）的超导环的基态性质，提出耦合超导环的有限U安德森杂质的理论处理方案。针对处于混合价态区域的QD，我们展示该系统基态的单重态-双重态跃迁，结果表明超导环中的超电流随外部包围磁通量振荡，并在单重态-双重态相变点处出现突变跳变。
英文摘要
We investigate the ground state properties of a superconducting ring embedded with a quantum dot (QD) by using a variational wave-function approach. A theoretical formulation for the treatment of the finite-U Anderson impurity coupled with a superconducting ring are presented. We demonstrate singlet-doublet transitions of the ground state for this system with the QD in the mixed valence regime. It is shown that the supercurrent in the superconductor ring shows oscillations with the external enclosed magnetic flux and exhibits abrupt jumps at the singlet-doublet phase transition points.
Comments8 pages, 5 figures
