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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Published on: July 11, 2025

Plasmons in graphene moiré superlattices.

G X Ni^1,2, H Wang³, J S Wu²

¹Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore.

Nature Materials

|September 29, 2015

Summary

Researchers explored collective electronic oscillations in moiré graphene superlattices using infrared nano-imaging. They discovered novel composite infrared plasmons arising from superlattice mini-bands and Dirac band electrons.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Moiré patterns emerge from superimposing crystals with slight lattice mismatches, creating superlattices.
Graphene on hexagonal boron nitride (hBN) is a key example, significantly altering graphene's electronic band structure.

Purpose of the Study:

To investigate the dynamical response of moiré graphene superlattices.
To probe the propagation of surface plasmons in these engineered materials.

Main Methods:

Utilized infrared (IR) nano-imaging techniques.
Studied the collective oscillations of electrons (surface plasmons) coupled to IR light.

Main Results:

Identified two additive contributions to composite IR plasmons in graphene moiré superstructures.
These contributions stem from interband transitions in superlattice mini-bands and free electrons in Dirac bands.

Conclusions:

Demonstrated a novel form of collective electronic modes in moiré graphene.
This phenomenon is likely applicable to other moiré superlattices and van der Waals heterostructures.