Palladium gates for reproducible quantum dots in silicon

Brauns, Matthias and Amitonov, Sergey V and Spruijtenburg, Paul-Christiaan and Zwanenburg, Floris A (2018) Palladium gates for reproducible quantum dots in silicon. Scientific Reports, 8 (1). Article number: 5690 . ISSN 20452322

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We replace the established aluminium gates for the formation of quantum dots in silicon with gates made from palladium. We study the morphology of both aluminium and palladium gates with transmission electron microscopy. The native aluminium oxide is found to be formed all around the aluminium gates, which could lead to the formation of unintentional dots. Therefore, we report on a novel fabrication route that replaces aluminium and its native oxide by palladium with atomic-layer-deposition-grown aluminium oxide. Using this approach, we show the formation of low-disorder gate-defined quantum dots, which are reproducibly fabricated. Furthermore, palladium enables us to further shrink the gate design, allowing us to perform electron transport measurements in the few-electron regime in devices comprising only two gate layers, a major technological advancement. It remains to be seen, whether the introduction of palladium gates can improve the excellent results on electron and nuclear spin qubits defined with an aluminium gate stack.

Item Type: Article
DOI: 10.1038/s41598-018-24004-y
Uncontrolled Keywords: Electronic devices, spintronics
Subjects: 500 Science > 530 Physics > 539 Modern physics
Research Group: Katsaros Group
SWORD Depositor: Sword Import User
Depositing User: Sword Import User
Date Deposited: 24 Apr 2018 09:12
Last Modified: 24 Apr 2018 09:12

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