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

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Moiré modulation of charge density waves.

Zachary A H Goodwin^1,2, Vladimir I Fal'ko^1,2,3

¹National Graphene Institute, University of Manchester, Booth St. E., Manchester M13 9PL, United Kingdom.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|October 12, 2022

Summary

Twisted transition metal dichalcogenide bilayers show how charge density waves (CDWs) interact with moiré patterns. CDW behavior depends on the moiré structure, with some CDWs propagating and others being confined to domains.

Keywords:

charge density waves moiré materials transition metal dichalcogenides twistronics

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Area of Science:

Condensed Matter Physics
Materials Science
2D Materials

Background:

Charge density waves (CDWs) are inherent properties of certain 2D materials.
Twisted van der Waals heterostructures offer tunable electronic properties.
Metallic transition metal dichalcogenides (TMDs) are promising platforms for studying CDWs.

Purpose of the Study:

Investigate the interplay between moiré superlattices and intrinsic CDWs in twisted TMD homobilayers.
Understand how atomic reconstruction at small twist angles affects CDW behavior.
Explore the influence of moiré domain structure on CDW periodicity and propagation.

Main Methods:

Theoretical investigation of twisted bilayer metallic TMDs.
Analysis of atomic reconstruction and moiré domain formation at various twist angles.
Modeling of CDW phase behavior within the moiré superlattice structure.

Main Results:

3x3 CDWs can propagate through the moiré structure without geometric constraints.
2x2 CDWs are confined to moiré domains, with their phase destroyed in domain walls.
Twist angles near 0° and 180° lead to distinct moiré-scale structures (dimers and triangles).
13x13 CDWs (star-of-David) are also confined to domains due to specific stacking configurations.

Conclusions:

The moiré superlattice significantly dictates CDW behavior in twisted TMDs.
CDW periodicity and domain interactions are strongly dependent on the twist angle and moiré pattern.
Experimental verification in twisted bilayer metallic TMDs is proposed to confirm these findings.