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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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Graphene-Based Quantum Hall Interferometer with Self-Aligned Side Gates.

Lingfei Zhao¹, Ethan G Arnault¹, Trevyn F Q Larson¹

¹Department of Physics, Duke University, Durham, North Carolina27708, United States.

|November 28, 2022

Summary

This summary is machine-generated.

Researchers developed a new method to create high-quality graphene quantum point contacts (QPCs) by etching a trench. This breakthrough enables the study of quantum Hall interferometers, overcoming previous fabrication challenges in graphene devices.

Keywords:

Graphene Quantum Hall Interferometer Quantum Point Contacts Side Gates

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Area of Science:

Condensed matter physics
Materials science
Nanotechnology

Background:

Graphene's zero band gap complicates the fabrication of high-quality quantum point contacts (QPCs).
Conventional split-gate methods lead to p-n interfaces that short-circuit QPCs, hindering graphene quantum Hall Fabry-Pérot interferometer development.
Recent advances enabled QPCs using the resistive ν = 0 state, but simpler fabrication is needed.

Purpose of the Study:

To present a straightforward fabrication method for graphene quantum point contacts (QPCs).
To demonstrate the operation of these QPCs in the quantum Hall regime.
To utilize the fabricated QPCs for constructing and investigating a quantum Hall interferometer.

Main Methods:

Etching a narrow trench in the graphene sheet to isolate the conducting channel.
Fabricating self-aligned graphene side gates adjacent to the etched trench.
Characterizing individual QPC operation in the quantum Hall regime.

Main Results:

Successful fabrication of graphene QPCs using a simple trench-etching technique.
Demonstrated reliable operation of individual QPCs within the quantum Hall regime.
Utilized the fabricated QPCs to construct a functional quantum Hall interferometer.

Conclusions:

The trench-etching method provides a simple and effective route to high-quality graphene QPCs.
This technique overcomes previous limitations, facilitating the study of quantum phenomena in graphene.
The developed QPCs are suitable for building and exploring quantum Hall interferometers.