Sketched Nanoscale KTaO3 -Based Superconducting Quantum Interference Device

IF 15.7 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical Review X Pub Date : 2025-02-20 DOI:10.1103/physrevx.15.011037

Muqing Yu, Nicholas Hougland, Qianheng Du, Junyi Yang, Sayanwita Biswas, Ranjani Ramachandran, Dengyu Yang, Anand Bhattacharya, David Pekker, Patrick Irvin, Jeremy Levy

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引用次数: 0

Abstract

The discovery of two-dimensional superconductivity in LaAlO3/KTaO3 (111) and (110) interfaces has raised significant interest in this system. In this paper, we report the first successful fabrication of a direct current superconducting quantum interference device (dc-SQUID) in the KTO system. The key device elements, superconducting weak links, are created by conductive atomic force microscope lithography, which can reversibly control the conductivity at the LAO/KTO (110) interface with nanoscale resolution. The periodic modulation of the SQUID critical current Ic(B) with magnetic field corresponds well with our theoretical modeling, which reveals a large kinetic inductance of the superconducting two-dimensional electron gas in KTO. The kinetic inductance of the SQUID is tunable by electrical gating from the back, due to the large dielectric constant of KTO. The demonstration of weak links and SQUIDs in KTO broadens the scope for exploring the underlying physics of KTO superconductivity, including the role of spin-orbit coupling, pairing symmetry, and inhomogeneity. It also promotes KTO as a versatile platform for a growing family of quantum devices, which could be applicable in the realm of quantum computing and information.

Published by the American Physical Society

2025

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基于KTaO3的纳米级超导量子干涉器件草图

LaAlO3/KTaO3（111）和（110）界面的二维超导性的发现引起了人们对该体系的极大兴趣。在本文中，我们报道了在KTO系统中首次成功制造直流超导量子干涉器件（dc-SQUID）。利用导电原子力显微镜光刻技术制造出了关键器件元件——超导弱环节，该技术可以以纳米级分辨率可逆地控制LAO/KTO（110）界面的电导率。SQUID临界电流Ic(B)随磁场的周期性调制与理论模型相吻合，揭示了KTO中超导二维电子气具有较大的动力学电感。由于KTO的介电常数大，SQUID的动态电感可以通过背后的电门控来调节。KTO中弱链接和squid的证明拓宽了探索KTO超导性的潜在物理范围，包括自旋-轨道耦合，配对对称性和非均匀性的作用。它还促进了KTO作为一个不断增长的量子设备家族的通用平台，这可能适用于量子计算和信息领域。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review X PHYSICS, MULTIDISCIPLINARY-

CiteScore

24.60

自引率

1.60%

发文量

197

审稿时长

3 months

期刊介绍： Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.