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Related Experiment Videos

Tunable supercurrent through semiconductor nanowires.

Yong-Joo Doh1, Jorden A van Dam, Aarnoud L Roest

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.

Science (New York, N.Y.)
|July 9, 2005
PubMed
Summary
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Researchers created nanoscale superconductor/semiconductor devices using indium arsenide nanowires. These devices exhibit tunable Josephson junctions, allowing supercurrent control via gate voltage and demonstrating correlated fluctuations.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Superconductor/semiconductor hybrid devices are crucial for quantum technologies.
  • Indium arsenide nanowires offer unique electronic properties for nanoscale devices.
  • Proximity-induced superconductivity is a key phenomenon in hybrid systems.

Purpose of the Study:

  • To assemble and characterize nanoscale superconductor/semiconductor hybrid devices.
  • To investigate the properties of Josephson junctions formed in these hybrid systems.
  • To explore the control of supercurrent and correlated fluctuations using gate voltage.

Main Methods:

  • Fabrication of indium arsenide nanowire devices contacted by aluminum superconductor electrodes.
  • Measurement of device characteristics at temperatures below 1 Kelvin.

Related Experiment Videos

  • Application of gate voltage to tune electron density and study electrical transport.
  • Analysis of critical current fluctuations and normal-state conductance.

    • Main Results:

    • Demonstrated proximity-induced superconductivity in indium arsenide nanowires.
    • Established tunable mesoscopic Josephson junctions with electrically controlled coupling.
    • Showcased on/off switching of supercurrent via gate voltage.
    • Observed universal conductance fluctuations correlated with critical current fluctuations.
    • Confirmed alternating-current Josephson effect and Shapiro steps under microwave irradiation.

    Conclusions:

    • Nanoscale superconductor/semiconductor hybrid devices enable tunable Josephson junctions.
    • Gate voltage provides effective control over supercurrent and device properties.
    • Correlated fluctuations offer insights into mesoscopic quantum phenomena.