Shadow-wall lithography of ballistic superconductor–semiconductor quantum devices

Sebastian Heedt*, Marina Quintero-Pérez, Francesco Borsoi, Nick van Loo, Grzegorz P. Mazur, Mark Ammerlaan, Kongyi Li, Svetlana Korneychuk, May An Y. van de Poll, Nick de Jong, Pavel Aseev, Kevin van Hoogdalem, Leo P. Kouwenhoven, More Authors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)
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The realization of hybrid superconductor–semiconductor quantum devices, in particular a topological qubit, calls for advanced techniques to readily and reproducibly engineer induced superconductivity in semiconductor nanowires. Here, we introduce an on-chip fabrication paradigm based on shadow walls that offers substantial advances in device quality and reproducibility. It allows for the implementation of hybrid quantum devices and ultimately topological qubits while eliminating fabrication steps such as lithography and etching. This is critical to preserve the integrity and homogeneity of the fragile hybrid interfaces. The approach simplifies the reproducible fabrication of devices with a hard induced superconducting gap and ballistic normal-/superconductor junctions. Large gate-tunable supercurrents and high-order multiple Andreev reflections manifest the exceptional coherence of the resulting nanowire Josephson junctions. Our approach enables the realization of 3-terminal devices, where zero-bias conductance peaks emerge in a magnetic field concurrently at both boundaries of the one-dimensional hybrids.

Original languageEnglish
Article number4914
Number of pages9
JournalNature Communications
Issue number1
Publication statusPublished - 2021


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