Supercurrent and Superconducting Diode Effect in Parallel Double Quantum Dots with Rashba Spin-Orbit Interaction.

Feng Chi, Yaohong Shen, Yumei Gao, Jia Liu, Zhenguo Fu, Zichuan Yi, Liming Liu

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Article in Materials (Basel, Switzerland), 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

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1citing papers in PubMed

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1 citing paper in PubMed.

Flux-Dependent Superconducting Diode Effect in an Aharonov-Bohm Interferometer.Materials (Basel, Switzerland) · 2025
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7 authors.

Feng ChiSchool of Electronic and Information Engineering, UEST of China, Zhongshan Institute, Zhongshan 528400, China.

Yaohong ShenSouth China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.

Yumei GaoSchool of Electronic and Information Engineering, UEST of China, Zhongshan Institute, Zhongshan 528400, China.

Jia LiuSchool of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China.

Zhenguo FuInstitute of Applied Physics and Computational Mathematics, Beijing 100088, China.ORCID 0000-0002-2448-5562

Zichuan YiSchool of Electronic and Information Engineering, UEST of China, Zhongshan Institute, Zhongshan 528400, China.ORCID 0000-0001-7670-7916

Liming LiuSchool of Electronic and Information Engineering, UEST of China, Zhongshan Institute, Zhongshan 528400, China.

Funding

Guangdong Province Education Department 2023KTSCX174Innovation Team of Colleges and Universities in Guangdong Province 2021KCXTD040National Natural Science Foundation of China 12264037Science and Technology Bureau of Zhongshan 2023B2035the Key Laboratory of Guangdong Higher Education Institutes 2023KSYS011

6 · The paper itself

Abstract

We study theoretically the supercurrent and the superconducting diode effect (SDE) in a structure comprising parallel-coupled double quantum dots (DQDs) sandwiched between two superconductor leads in the presence of a magnetic flux. The influence of the Rashba spin-orbit interaction (RSOI), which induces a spin-dependent phase factor in the dot-superconductor coupling strength, is taken into account by adopting the nonequilibrium Green's function technique. This RSOI-induced phase factor serves as a driving force for the supercurrent in addition to the usual superconducting phase difference, and it leads to the system's left/right asymmetry. Correspondingly, the magnitude of the positive and negative critical currents become different from each other: the so-called SDE. Our results show that the period, magnitude, and direction of the supercurrents depend strongly on the RSOI-induced phase factor, dots' energy levels, interdot coupling strengths, and the magnetic flux. In the absence of magnetic flux, the diode efficiency is negative and may approach -2, which indicates the perfect diode effect with only negative flowing supercurrent in the absence of a positive one. Interestingly enough, both the sign and magnitude of the diode efficiency can be efficiently adjusted with the help of magnetic flux, the dots' energy levels and the interdot coupling strength and thus provide a controllable SDE by rich means, such as gate voltage or host materials of the system.

Indexed as

magnetic fluxparallel double quantum dotsspin–orbit interactionsuperconducting diode effectsupercurrent

Identifiers

PMID39336238

DOI10.3390/ma17184497

PMCPMC11433276

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