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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
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Orderly disorder in magic-angle twisted trilayer graphene
Simon Turkel1, Joshua Swann1, Ziyan Zhu2
1Department of Physics, Columbia University, New York, NY 10027, USA.
Science (New York, N.Y.)
|April 7, 2022
Summary
Magic-angle twisted trilayer graphene (TTG) exhibits reconstructed moiré lattices with localized faults. These structural features create a granular electronic landscape, with uniform states at superconductivity-inducing dopings.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Magic-angle twisted trilayer graphene (TTG) is a novel platform for exploring strongly correlated flat bands.
- Superconductivity has been observed in TTG, but its normal-state properties remain incompletely understood.
Purpose of the Study:
- To investigate the normal-state structural and electronic properties of TTG at superconducting twist angles.
- To understand the relationship between structural reconstructions and electronic properties in TTG.
Main Methods:
- Low-temperature scanning tunneling microscopy (STM).
- Analysis of moiré lattice reconstruction and electronic properties.
Main Results:
- Real TTG samples exhibit significant moiré lattice reconstruction, forming near-magic-angle, mirror-symmetric domains.
- Localized twist-angle faults, termed twistons and moiré solitons, introduce electronic structure deviations.
- A doping-dependent, spatially granular electronic landscape is observed.
- Maximum uniformity of the Fermi-level density of states occurs at dopings associated with superconductivity.
Conclusions:
- Structural reconstruction and localized faults in TTG create a complex electronic landscape.
- The observed electronic uniformity at specific dopings correlates with superconductivity, offering insights into its mechanism.
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