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- W4387560256 abstract "Semiconductor quantum dots in close proximity to superconductors may provoke localized bound states within the superconducting energy gap known as Yu-Shiba-Rusinov (YSR) state, which is a promising candidate for constructing Majorana zero modes and topological qubits. Side-coupled double quantum dot systems are ideal platforms revealing the secondary proximity effect. Numerical renormalization group calculations show that, if the central quantum dot can be treated as a noninteracting resonant level, it acts as a superconducting medium due to the ordinary proximity effect. The bound state in the side dot behaves as the case of a single impurity connected to two superconducting leads. The side dot undergoes quantum phase transitions between a singlet state and a doublet state as the Coulomb repulsion, the interdot coupling strength, or the energy level sweeps. Phase diagrams indicate that the phase boundaries could be well illustrated by $Delta approx c {T_{K2}}$ in all cases, with $Delta$ is the superconducting gap, $T_{K2}$ is the side Kondo temperature and $c$ is of the order $1.0$. These findings offer valuable insights into the secondary proximity effect, and show great importance for designing superconducting quantum devices." @default.
- W4387560256 created "2023-10-12" @default.
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- W4387560256 date "2023-10-09" @default.
- W4387560256 modified "2023-10-18" @default.
- W4387560256 title "Secondary proximity effect in a side-coupled double quantum dot structure" @default.
- W4387560256 doi "https://doi.org/10.48550/arxiv.2310.05663" @default.
- W4387560256 hasPublicationYear "2023" @default.
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