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Related Experiment Video

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Published on: April 4, 2017

Mechanically controlled quantum interference in graphene break junctions.

Sabina Caneva¹, Pascal Gehring¹, Víctor M García-Suárez^2,3

¹Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands.

Nature Nanotechnology

|September 19, 2018

Summary

This summary is machine-generated.

Researchers observed quantum interference in graphene nanoconstrictions, revealing Fabry-Pérot-like electron wave behavior. This finding advances fundamental physics and potential electronic device applications.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Mechanics

Background:

Quantum interference is crucial for fundamental research and developing electronic devices like resonators and interferometers.
Electron wave nature leads to interference effects, such as Fabry-Pérot and Aharonov-Bohm effects, with theoretical predictions in carbon nanotubes and graphene bilayers.
Experimental verification of quantum interference in graphene bilayers has been lacking.

Purpose of the Study:

To experimentally investigate quantum interference phenomena in graphene nanoconstrictions.
To explore the relationship between relative layer displacement and conductance oscillations in graphene bilayers.
To provide experimental evidence for Fabry-Pérot-like interference in graphene systems.

Main Methods:

Fabrication of bowtie-shaped graphene nanoconstrictions using mechanically controlled break junctions.
Measurement of electrical conductance as a function of subnanometre displacements at room temperature.
Charge-transport calculations to analyze the origin of conductance oscillations and periodicity.

Main Results:

Pronounced electrical conductance oscillations observed at room temperature in graphene nanoconstrictions.
Oscillation amplitudes modulated significantly with subnanometre displacements.
Observed oscillation periodicity larger than the graphene lattice constant, attributed to combined quantum interference and lattice commensuration effects.

Conclusions:

Direct experimental observation of Fabry-Pérot-like interference of electron waves in a graphene bilayer system.
Demonstrated the influence of relative layer sliding on quantum interference phenomena.
Highlighted the potential of graphene nanoconstrictions as a model system for studying quantum transport.