Researchers create superconducting germanium semiconductor material using standard chip fabrication techniques – prototype demonstrates millions of superconducting junctions on a 2-inch wafer

Researchers at NYU and the University of Queensland have demonstrated superconductivity in gallium-doped epitaxial germanium, fabricated using industry-standard semiconductor tools. The new material switches to a superconducting state below 3.5 Kelvin and supports dense, wafer-scale Josephson junction arrays, an important building block for quantum and cryogenic RF circuits.

The team’s prototype demonstrates millions of superconducting junctions integrated on a single 2-inch wafer. Junctions were…