Max Kouwenhoven
Leiden, Zuid-Holland, Nederland
1K volgers
Meer dan 500 connecties
Ervaring
Opleiding
Ervaring als vrijwilliger
-
Coördinator
Alzheimer Nederland
- heden 5 jaar
Gezondheid
Coordinator for Alzheimer Nederland in the township of Zandvoort responsible for organizing the collection of donations.
Publicaties
-
Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium
Physical Review B
We fabricate Josephson field-effect-transistors in germanium quantum wells contacted by superconducting aluminum and demonstrate supercurrents carried by holes that extend over junction lengths of several micrometers. In superconducting quantum point contacts we observe discretization of supercurrent, as well as Fabry-Perot resonances, demonstrating ballistic transport. The magnetic field dependence of the supercurrent follows a clear Fraunhofer-like pattern and Shapiro steps appear upon…
We fabricate Josephson field-effect-transistors in germanium quantum wells contacted by superconducting aluminum and demonstrate supercurrents carried by holes that extend over junction lengths of several micrometers. In superconducting quantum point contacts we observe discretization of supercurrent, as well as Fabry-Perot resonances, demonstrating ballistic transport. The magnetic field dependence of the supercurrent follows a clear Fraunhofer-like pattern and Shapiro steps appear upon microwave irradiation. Multiple Andreev reflections give rise to conductance enhancement and evidence a transparent interface, confirmed by analyzing the excess current. These demonstrations of ballistic superconducting transport are promising for hybrid quantum technology in germanium.
Andere auteursPublicatie weergeven -
Gate-controlled quantum dots and superconductivity in planar germanium
Nature Communications
Superconductors and semiconductors are crucial platforms in the field of quantum computing. They can be combined to hybrids, bringing together physical properties that enable the discovery of new emergent phenomena and provide novel strategies for quantum control. The involved semiconductor materials, however, suffer from disorder, hyperfine interactions or lack of planar technology. Here we realise an approach that overcomes these issues altogether and integrate gate-defined quantum dots and…
Superconductors and semiconductors are crucial platforms in the field of quantum computing. They can be combined to hybrids, bringing together physical properties that enable the discovery of new emergent phenomena and provide novel strategies for quantum control. The involved semiconductor materials, however, suffer from disorder, hyperfine interactions or lack of planar technology. Here we realise an approach that overcomes these issues altogether and integrate gate-defined quantum dots and superconductivity into germanium heterostructures. In our system, heavy holes with mobilities exceeding 500,000 cm2 (Vs)−1 are confined in shallow quantum wells that are directly contacted by annealed aluminium leads. We observe proximity-induced superconductivity in the quantum well and demonstrate electric gate-control of the supercurrent. Germanium therefore has great promise for fast and coherent quantum hardware and, being compatible with standard manufacturing, could become a leading material for quantum information processing.
Andere auteursPublicatie weergeven
Onderscheidingen
-
KNAW Onderwijsprijs
De Koninklijke Nederlandse Akademie van Wetenschappen
knawonderwijsprijs.nl/winnaars/winnaars-2012
Overige vergelijkbare profielen
Anderen hebben Max Kouwenhoven genoemd
2 anderen door wie Max Kouwenhoven is genoemd, gebruiken LinkedIn
Bekijk anderen die Max Kouwenhoven heten