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

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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.

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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.