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2 results on '"Josephson field effect transistors"'

1. Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium

Author

M.L.V. Tagliaferri, Amir Sammak, Menno Veldhorst, R. Li, M. Kouwenhoven, Alexander Brinkman, N.W. Hendrickx, David P. Franke, Giordano Scappucci, and Interfaces and Correlated Electron Systems

Subjects
Materials science, Germanium quantum wells, Quantum technologies, Quantum point contact, Ballistics, chemistry.chemical_element, FOS: Physical sciences, Germanium, 02 engineering and technology, Field effect transistors, 01 natural sciences, Josephson field effect transistors, Superconductivity (cond-mat.supr-con), Ballistic conduction, Condensed Matter::Superconductivity, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Point contacts, 010306 general physics, Quantum well, Microwave irradiation, Superconductivity, Condensed Matter::Quantum Gases, Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, Josephson coupling, Condensed Matter - Superconductivity, Supercurrent, Magnetic field dependences, 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Ballistic transports, Magnetic field, Quantum technology, Micrometers, chemistry, Multiple andreev reflections, 0210 nano-technology, Quantum Physics (quant-ph), Quantum chemistry
Abstract

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. A© 2019 American Physical Society.

Published
2019
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2. Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium

Subjects
Germanium quantum wells, Germanium, Josephson coupling, Quantum technologies, Ballistics, Magnetic field dependences, Field effect transistors, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Ballistic transports, Micrometers, Josephson field effect transistors, Condensed Matter::Superconductivity, Point contacts, Multiple andreev reflections, Quantum chemistry, Microwave irradiation, Quantum point contact
Abstract

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. A© 2019 American Physical Society.

Published
2019

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