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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Reflectionless tunneling at the interface between nanoparticles and superconductors.

J L Dunford¹, A-A Dhirani

¹Department of Chemistry, University of Toronto, Ontario, Canada, M5S 3H6.

Physical Review Letters

|June 4, 2008

Summary

This summary is machine-generated.

We observed unique conductance oscillations at the interface between disordered normal materials and superconductors. These oscillations, dependent on voltage and magnetic field, confirm a predicted "reflectionless tunneling" phenomenon.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Interfaces between disordered normal (DN) materials and superconductors (S) exhibit zero-bias conductance peaks.
Previous studies have not reported correlated conductance oscillations dependent on both voltage and magnetic field.

Purpose of the Study:

To investigate novel conductance phenomena at DN-S interfaces.
To explore the potential of molecularly linked nanoparticle films in understanding quantum phenomena.

Main Methods:

Fabrication of disordered normal (DN) material using molecularly linked gold nanoparticle films.
Measurement of electrical conductance at the interface between DN films and superconductors (S).
Analysis of conductance oscillations as a function of bias voltage and magnetic field.

Main Results:

Observed conductance peaks at zero-bias voltage and magnetic field, as expected.
Discovered superimposed conductance oscillations simultaneously dependent on voltage and magnetic field.
Correlated the extracted length scales from oscillation periods with the nanostructure of the gold nanoparticle films.

Conclusions:

The observed correlated conductance oscillations provide the first experimental evidence of the