Germanium Quantum-Well Josephson Field-Effect Transistors and Interferometers

• DOI: 10.1021/acs.nanolett.8b04275
• Publication Date: 2019-01-11T21:13:08Z
• Authors: Florian Vigneau; Raisei Mizokuchi; Dante Colao Zanuz; Xuhai Huang; Susheng Tan; Romain Maurand; Sergey Frolov; Amir Sammak; Giordano Scappucci; Francois Lefloch; Silvano De France...
• Keywords: Supercurrent; Superconducting tunnel junction

Hybrid superconductor–semiconductor structures attract increasing attention owing to a variety of potential applications in quantum computing devices. They can serve the realization topological superconducting systems as well gate-tunable bits. Here, we combine SiGe/Ge/SiGe quantum-well heterostructure hosting high-mobility two-dimensional holes and aluminum leads realize prototypical hybrid devices, such Josephson field-effect transistors (JoFETs) interference devices (SQUIDs). We observe gate-controlled supercurrent transport with Ge channels long one micrometer estimate induced gap from tunnel spectroscopy measurements. Transmission electron microscopy reveals diffusion into Al contacts, whereas no is detected channel.