Epitaxy of Advanced Nanowire Quantum Devices

Semiconductor nanowires provide an ideal platform for various low-dimensional quantum devices. In particular, topological phases of matter hosting non-Abelian quasi-particles can emerge when a semiconductor nanowire with strong spin-orbit coupling is brought in contact with a superconductor. To full...

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Bibliographic Details
Published in:arXiv.org 2021-12
Main Authors: Gazibegovic, Sasa, Car, Diana, Zhang, Hao, Balk, Stijn C, Logan, John A, Michiel W A de Moor, Cassidy, Maja C, Schmits, Rudi, Xu, Di, Wang, Guanzhong, Krogstrup, Peter, Roy L M Op het Veld, Shen, Jie, Bouman, Daniël, Shojaei, Borzoyeh, Pennachio, Daniel, Lee, Joon Sue, van Veldhoven, Petrus J, Koelling, Sebastian, Verheijen, Marcel A, Kouwenhoven, Leo P, Palmstrøm, Chris J, Erik P A M Bakkers
Format: Article
Language:English
Subjects:
Braiding
Computer architecture
Crystal structure
Crystallinity
Epitaxy
Islands
Nanowires
Quantum computing
Quantum transport
Single crystals
Spin-orbit interactions
Structural analysis
Superconductivity
Topology
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Summary:Semiconductor nanowires provide an ideal platform for various low-dimensional quantum devices. In particular, topological phases of matter hosting non-Abelian quasi-particles can emerge when a semiconductor nanowire with strong spin-orbit coupling is brought in contact with a superconductor. To fully exploit the potential of non-Abelian anyons for topological quantum computing, they need to be exchanged in a well-controlled braiding operation. Essential hardware for braiding is a network of single-crystalline nanowires coupled to superconducting islands. Here, we demonstrate a technique for generic bottom-up synthesis of complex quantum devices with a special focus on nanowire networks having a predefined number of superconducting islands. Structural analysis confirms the high crystalline quality of the nanowire junctions, as well as an epitaxial superconductor-semiconductor interface. Quantum transport measurements of nanowire "hashtags" reveal Aharonov-Bohm and weak-antilocalization effects, indicating a phase coherent system with strong spin-orbit coupling. In addition, a proximity-induced hard superconducting gap is demonstrated in these hybrid superconductor-semiconductor nanowires, highlighting the successful materials development necessary for a first braiding experiment. Our approach opens new avenues for the realization of epitaxial 3-dimensional quantum device architectures.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.01480