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Singlet-doublet transitions and Josephson currents in a superconducting ring with a quantum dot
Abstract
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.
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BibTeX
@misc{ding2026singletdoublet,
title = {{Singlet-doublet transitions and Josephson currents in a superconducting ring with a quantum dot}},
author = {Guo-Hui Ding and Fei Ye and Bing Dong},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.30306},
eprint = {2608.30306},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.30306},
}
RIS
TY - UNPB
TI - Singlet-doublet transitions and Josephson currents in a superconducting ring with a quantum dot
AU - Guo-Hui Ding
AU - Fei Ye
AU - Bing Dong
PY - 2026
DA - 2026/08/31
PB - arXiv
DO - 10.48550/arxiv.2608.30306
UR - https://arxiv.org/abs/2608.30306
AB - 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.
ER -