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Related Experiment Video

Updated: Feb 8, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Gate-Defined Electron-Hole Double Dots in Bilayer Graphene.

L Banszerus^1,2, B Frohn¹, A Epping^1,2

¹JARA-FIT and 2nd Institute of Physics , RWTH Aachen University , 52074 Aachen , Germany, European Union.

|June 28, 2018

Summary

We demonstrate precise control over bilayer graphene quantum dots, enabling single, double, and triple-dot operations. This advancement facilitates detailed studies of electron-hole double dots and their magnetic field responses.

Keywords:

Bilayer graphene double dots electrostatic confinement quantum dots

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Area of Science:

Condensed matter physics
Quantum electronics
Graphene nanotechnology

Background:

Bilayer graphene is a promising material for quantum devices.
Electrostatically defined quantum dots allow for tunable electronic properties.
Previous fabrication methods limited precise control over carrier confinement.

Purpose of the Study:

To demonstrate gate-controlled quantum dot operation in bilayer graphene.
To characterize electron-hole double-dot systems.
To investigate the magnetic field response of single-dot energy levels.

Main Methods:

Utilizing encapsulated bilayer graphene with hexagonal boron nitride.
Employing graphite gates for electrostatic confinement and current pinch-off.
Characterizing device performance through transport measurements.

Main Results:

Achieved stable single-, double-, and triple-dot operation.
Implemented two distinct electron-hole double-dot systems with similar energy scales.
Observed Zeeman spin-splitting in single-dot excited states with a g-factor of 2.

Conclusions:

Advanced fabrication techniques enable high-fidelity electrostatic control in bilayer graphene quantum dots.
The demonstrated devices are suitable for exploring complex quantum phenomena.
The results validate theoretical predictions for spin properties in graphene quantum dots.