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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Related Experiment Video

Updated: Mar 19, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Quantum Interference in Graphene Nanoconstrictions.

Pascal Gehring¹, Hatef Sadeghi², Sara Sangtarash²

¹Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.

|June 14, 2016

Summary

This summary is machine-generated.

Quantum interference in graphene nanoconstrictions reveals multimode Fabry-Pérot and Fano resonances. This study enhances understanding of quantum phenomena in advanced electronic materials.

Keywords:

Fabry−Pérot Fano resonance Graphene break junction quantum interference

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Last Updated: Mar 19, 2026

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Area of Science:

Condensed matter physics
Materials science
Nanotechnology

Background:

Graphene nanoconstrictions are promising for electronic devices.
Understanding quantum interference is crucial for nanoscale electronics.
Fabrication methods for controlled graphene nanostructures are under development.

Purpose of the Study:

To investigate quantum interference effects in electrical conductance of graphene nanoconstrictions.
To analyze the nature of observed interference patterns, including Fabry-Pérot and Fano resonances.
To provide theoretical insights into the interplay of different quantum interference mechanisms.

Main Methods:

Fabrication of graphene nanoconstrictions using chemical vapor deposition and feedback-controlled electroburning.
Electrical conductance measurements to probe quantum interference.
Theoretical modeling to interpret experimental observations.

Main Results:

Observed multimode Fabry-Pérot interferences attributed to reflections at potential steps.
Detected sharp antiresonance features with a Fano line shape.
Theoretical modeling confirmed Fano resonances arise from localized states coupling to delocalized states.

Conclusions:

Demonstrated quantum interference effects in graphene nanoconstrictions.
Identified the interplay between Fabry-Pérot and Fano interference mechanisms.
Provided new insights into the fundamental quantum physics governing electron transport in graphene nanostructures.