Direct writing of high temperature superconducting Josephson junctions using a thermal scanning probe

2024/10/01 by Ngoc My Hanh Duong, Duong, Ngoc My Hanh, Amanuel M. Berhane +16
Physics and Astronomy · Engineering · #Physics of Superconductivity and Magnetism #Advanced Electrical Measurement Techniques #Surface and Thin Film Phenomena

paper · pdf · doi:10.48550/arxiv.2410.00372

Abstract

In this letter, we demonstrate for the first time the creation of Josephson-like superconducting nanojunctions using a thermal scanning probe to directly inscribe weak links into microstrips of YBa2Cu3O7-x (YBCO). Our method effectively reduces the critical current (Ic) over an order of magnitude. The resulting nanobridges exhibit clear evidence of Josephson effects, of SNS-type junctions, as shown by both the DC and AC Josephson effects. This approach provides a novel and flexible method for scaling up quantum mechanical circuits that operate at liquid nitrogen temperatures. Additionally, it offers a promising pathway for modifying properties of the junctions in-situ and post fabrication.

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