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Related Experiment Video

Updated: Feb 4, 2026

Production and Targeting of Monovalent Quantum Dots

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

Josephson Effect in a Few-Hole Quantum Dot.

Joost Ridderbos¹, Matthias Brauns¹, Jie Shen²

¹MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)

|September 28, 2018

Summary

This summary is machine-generated.

This study demonstrates a germanium-silicon (Ge-Si) core-shell nanowire Josephson field-effect transistor. It achieves high transparency and operates in two distinct regimes, paving the way for Majorana fermion research.

Keywords:

silicon quantum electronics superconductor-semiconductor hybrids

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Electronics

Background:

Superconductor-semiconductor hybrid devices are crucial for exploring exotic quantum phenomena.
Germanium-silicon (Ge-Si) core-shell nanowires offer unique electronic properties for device applications.

Purpose of the Study:

To realize a Josephson field-effect transistor using Ge-Si core-shell nanowires.
To investigate the device's behavior in distinct electrical regimes.
To establish Ge-Si nanowires as a platform for hybrid physics and Majorana fermion research.

Main Methods:

Fabrication of a Ge-Si core-shell nanowire Josephson field-effect transistor.
Utilizing highly transparent contacts to superconducting leads.
Modulating device characteristics via electric field tuning to access different operating regimes.

Main Results:

The device exhibits highly transparent contacts, enabling efficient supercurrent flow.
Two distinct operational regimes were achieved in a single device: accumulation mode with multiple subbands and depletion mode with single-particle quantum dot levels.
Demonstrated control over supercurrent transport through different electronic states.

Conclusions:

Ge-Si core-shell nanowires are a promising platform for advanced hybrid superconductor-semiconductor devices.
The demonstrated device capabilities are significant for advancing research in quantum dots and Majorana fermions.
This work opens new avenues for exploring fundamental physics in low-dimensional hybrid systems.