Polarization Controlled Supercurrent in Ferroelectric Josephson Junction

Dataset for publication "Polarization Controlled Supercurrent in Ferroelectric Josephson Junction" by Yaozu Tang, Mazhar N. Ali, Gerrit E. W. Bauer, and Yaroslav M. Blanter.

Abstract: Josephson junctions are essential devices in superconducting electronics and quantum computing hardware. Here we predict electrical control of the supercurrent in composite superconductor-insulator-ferroelectric-insulator-superconductor (S-I-FE-I-S) Josephson junctions. Inversion symmetry broken by unequal dielectric barrier thicknesses and/or potentials converts ferroelectric polarization reversal into a substantial change of the critical current. With a WKB tunneling model we obtain non-volatile switching of the critical current with on-off efficiency up to 0.9 for physically realistic parameters. This can be achieved by optimizing the thicknesses and potential barriers of the insulating layers, as well as the thickness and dielectric constant of the ferroelectric layer. We also derive a compact linear expression for the critical current valid for small polarizations. Our results identify ferroelectric Josephson junctions as electrically programmable superconducting current switches for cryogenic memory and logic applications.

A detailed description of the dateset is included in the README.txt file.

用于发表论文《铁电约瑟夫森结中的极化调控超电流》的数据集，作者为唐耀祖、Mazhar N. Ali、Gerrit E. W. Bauer及Yaroslav M. Blanter。

摘要：约瑟夫森结（Josephson junction）是超导电子学与量子计算硬件中的核心器件。本文预言了超导体-绝缘体-铁电体-绝缘体-超导体（S-I-FE-I-S）结构约瑟夫森结的超电流电学调控方案。因不等介电势垒厚度与/或电势引发的反演对称性破缺，可将铁电极化反转转化为临界电流的显著变化。借助WKB隧穿模型，我们在物理合理的参数范围内得到了通断效率最高可达0.9的临界电流非易失性切换行为。该调控效果可通过优化绝缘层的厚度与势垒电势、铁电层的厚度与介电常数实现。我们还推导了适用于小极化情形的临界电流简洁线性表达式。本研究结果表明，铁电约瑟夫森结可作为适用于低温存储器与逻辑应用的电学可编程超导电流开关。

本数据集的详细说明收录于README.txt文件中。