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Related Experiment Video

Updated: Sep 5, 2025

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

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

Published on: July 11, 2025

Robust superconductivity in magic-angle multilayer graphene family.

Jeong Min Park¹, Yuan Cao², Li-Qiao Xia²

¹Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA. parkjane@mit.edu.

Nature Materials

|July 7, 2022

Summary

Researchers discovered superconductivity in new multilayer graphene structures, expanding the family of moiré superconductors. This finding highlights the role of flat bands in superconductivity and offers insights for designing novel superconducting materials.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Materials

Background:

Magic-angle twisted bilayer graphene (MATBG) revealed correlated states and superconductivity.
Superconductivity is rare in moiré systems, previously limited to specific bilayer and trilayer graphene structures.

Purpose of the Study:

To experimentally realize superconductivity in magic-angle twisted four-layer and five-layer graphene.
To establish alternating twist magic-angle multilayer graphene as a robust family of moiré superconductors.
To investigate the role of flat bands and explore the behavior of these new superconductors in parallel magnetic fields.

Main Methods:

Fabrication of magic-angle twisted multilayer graphene (four-layer and five-layer).
Electrical transport measurements in parallel magnetic fields.
Investigation of Pauli limit violation and spontaneous rotational symmetry breaking.

Main Results:

Successful experimental realization of superconductivity in magic-angle twisted four-layer and five-layer graphene.
Demonstration of a new family of alternating twist magic-angle multilayer moiré superconductors.
Observation of distinct behaviors between N=2 and N>2 layer structures in parallel magnetic fields, linked to orbital responses.

Conclusions:

Alternating twist magic-angle multilayer graphene represents a robust family of moiré superconductors.
The flat bands inherent in these structures are crucial for superconductivity.
The findings provide insights into the mechanisms of moiré superconductivity and potential pathways for designing new superconducting materials.