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Related Experiment Video

Updated: Jul 11, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Oscillatory persistent currents in self-assembled quantum rings.

N A J M Kleemans¹, I M A Bominaar-Silkens, V M Fomin

¹PSN, COBRA, Eindhoven University of Technology, The Netherlands.

Physical Review Letters

|October 13, 2007

Summary

This summary is machine-generated.

Researchers directly measured persistent current in single electrons using quantum rings. This groundbreaking Aharonov-Bohm oscillation measurement confirms theoretical models for these nanostructures.

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Area of Science:

Condensed Matter Physics
Quantum Nanotechnology
Materials Science

Background:

Persistent currents are fundamental to understanding quantum phenomena in nanostructures.
Single-electron effects in quantum rings are challenging to probe directly.
Quantum rings offer unique platforms for exploring electron behavior.

Purpose of the Study:

To directly measure the persistent current carried by a single electron.
To investigate Aharonov-Bohm oscillations in self-assembled InAs/GaAs quantum rings.
To correlate experimental findings with structural properties and theoretical models.

Main Methods:

Magnetization experiments were employed to detect persistent currents.
Cross-sectional scanning tunneling microscopy (STM) was used to characterize nanostructure morphology.
Analysis of Aharonov-Bohm oscillations at high magnetic fields (14 T).

Main Results:

Direct measurement of the persistent current in a single electron was achieved.
The first Aharonov-Bohm oscillation was observed, matching theoretical predictions.
A large oscillation magnitude of magnetic moment per electron was found, attributed to singly connected and asymmetric ring topology.

Conclusions:

The study provides direct evidence of single-electron persistent currents in quantum rings.
Experimental results validate models incorporating structural properties of nanostructures.
The findings highlight the significant impact of nanostructure topology on quantum transport phenomena.