In-plane selective area InSb-Al nanowire quantum networks

Abstract

Strong spin-orbit semiconductor nanowires coupled to a superconductor are predicted to host Majorana zero modes. Exchange (braiding) operations of Majorana modes form the logical gates of a topological quantum computer and require a network of nanowires. Here, we develop an in-plane selective-area growth technique for InSb-Al semiconductor-superconductor nanowire networks with excellent quantum transport properties. Defect-free transport channels in InSb nanowire networks are realized on insulating, but heavily mismatched InP substrates by 1) full relaxation of the lattice mismatch at the nanowire/substrate interface on a (111)B substrate orientation, 2) nucleation of a complete network from a single nucleation site, which is accomplished by optimizing the surface diffusion length of the adatoms. Essential quantum transport phenomena for topological quantum computing are demonstrated in these structures including phase-coherent transport up to 10 $\mu$m and a hard superconducting gap accompanied by 2$e$-periodic Coulomb oscillations with an Al-based Cooper pair island integrated in the nanowire network.

arXiv commentData repository is available at https://doi.org/10.5281/zenodo.4589484 . Author version of the text before peer review, while see DOI for the published version

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• Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
• Ballistic PbTe Nanowire Devices
• Proximity effect in PbTe-Pb hybrid nanowire Josephson junctions
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• Selective Area Growth Rates of III-V Nanowires
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• Reducing disorder in PbTe nanowires for Majorana research
• SQUID oscillations in PbTe nanowire networks
• Self-consistent quasi-particle $GW$ and hybrid functional calculations for Al/InAs/Al heterojunctions: band offset and spin-orbit coupling effects
• Semiconductor Epitaxy in Superconducting Templates
• Statistical Reproducibility of Selective Area Grown InAs Nanowire Devices
• High-fidelity electronic structure and properties of InSb: $G_0{W}_0$ and Bayesian-optimized hybrid functionals and DFT+$U$ approaches
• Uncovering Bound States in the Continuum in InSb nanowire networks