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Related Experiment Video

Updated: Jan 18, 2026

Assembly of Complex Microtubule Structures

Assembly of Complex Microtubule Structures

Supercurrent reversal in quantum dots.

Jorden A van Dam¹, Yuli V Nazarov, Erik P A M Bakkers

¹Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands.

|August 11, 2006

Summary

This summary is machine-generated.

Researchers demonstrated controllable supercurrents in semiconductor nanowires. Adding a single electron spin to a quantum dot reversed the supercurrent, enabling tunable electronic properties for quantum devices.

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Last Updated: Jan 18, 2026

Assembly of Complex Microtubule Structures

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Spindle assembly: Dynein, Kinesin and Microtubules

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Area of Science:

Condensed Matter Physics
Quantum Computing
Nanotechnology

Background:

Supercurrents, carried by Cooper pairs with 2e charge, are fundamental to superconductivity.
Josephson junctions and superconducting quantum interference devices exhibit characteristic 2e charge and h/2e flux periodicities.
Quantum dots in semiconductor nanowires offer a platform for studying electron transport with strong Coulomb interactions.

Purpose of the Study:

To investigate supercurrents through a quantum dot in a semiconductor nanowire.
To explore the role of single electron spins and orbital wavefunctions in controlling supercurrent direction.
To demonstrate the feasibility of creating tunable pi-junctions using quantum coherent tunneling.

Main Methods:

Fabrication of a quantum dot in a semiconductor nanowire using local electrostatic gating.
Measurement of supercurrents through the quantum dot, focusing on electron tunneling via discrete energy levels.
Manipulation of the quantum dot's electronic state by adding a single electron spin to control supercurrent direction.

Main Results:

Observed single-electron tunneling through discrete quantum dot energy levels, leading to supercurrent.
Demonstrated that adding a single electron spin to the quantum dot reverses the supercurrent sign, creating a pi-junction.
Showed that the supercurrent sign is also dependent on the orbital wavefunction character when excited states are involved.

Conclusions:

Single-electron tunneling in quantum dots can support controllable supercurrents.
The sign of the supercurrent can be precisely controlled by manipulating electron spin and orbital states.
This work opens avenues for novel superconducting devices based on semiconductor quantum dots.