Home > Articles > Published articles > Hard superconducting gap in germanium |
Date: | 2023 |
Abstract: | The co-integration of spin, superconducting, and topological systems is emerging as an exciting pathway for scalable and high-fidelity quantum information technology. High-mobility planar germanium is a front-runner semiconductor for building quantum processors with spin-qubits, but progress with hybrid superconductor-semiconductor devices is hindered by the difficulty in obtaining a superconducting hard gap, that is, a gap free of subgap states. Here, we address this challenge by developing a low-disorder, oxide-free interface between high-mobility planar germanium and a germanosilicide parent superconductor. This superconducting contact is formed by the thermally-activated solid phase reaction between a metal, platinum, and the Ge/SiGe semiconductor heterostructure. Electrical characterization reveals near-unity transparency in Josephson junctions and, importantly, a hard induced superconducting gap in quantum point contacts. Furthermore, we demonstrate phase control of a Josephson junction and study transport in a gated two-dimensional superconductor-semiconductor array towards scalable architectures. These results expand the quantum technology toolbox in germanium and provide new avenues for exploring monolithic superconductor-semiconductor quantum circuits towards scalable quantum information processing. |
Grants: | European Commission 850641 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-327 Agencia Estatal de Investigación CEX2021-001214-S |
Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Language: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Subject: | Cointegration ; Germaniums (Ge) ; High mobility ; High-fidelity ; Josephson-junction ; Quantum information technologies ; Spin systems ; Spin-s systems ; Superconducting gaps ; Topological systems |
Published in: | Communications Materials, Vol. 4 (April 2023) , art. 23, ISSN 2662-4443 |
9 p, 2.5 MB |