Sketched Nanoscale KTaO3-Based Superconducting Quantum Interference Device

• DOI: 10.48550/arxiv.2310.16051
• Publication Date: 2023-01-01
• Authors: Muqing Yu; Nicholas Hougland; Qianheng Du; Junyi Yang; Sayanwita Biswas; Ranjani Ramachandran; Dengyu Yang; Anand Bhattacharya; David Pekker; Patrick Irvin; Jeremy Levy
• Keywords: Quantum interference

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