Interface transparency of 0.88 measured in germanium quantum device

Researchers at Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, and LETI have measured an interface transparency of 0.88 in a germanium quantum device, reporting a value that suggests remarkably efficient electron transfer between the semiconductor and a nearby aluminum superconductor. The work centers on Ge/SiGe quantum well heterostructures, which utilize a two-dimensional hole gas and are emerging as a promising platform for hybrid superconductor-semiconductor quantum devices. This precise measurement is in excellent agreement with theoretical expectations and reports evidence of a gate-tunable induced superconducting gap. Andreev Reflection Enhances Conductance Quantization to 0.88 A measured interface transparency of 0.88 was reported by researchers at Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, and LETI, in a Ge/SiGe heterostructure, a platform increasingly utilized for building these advanced quantum…