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Updated: Jun 2, 2026
11:24
Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
Unconventional Hysteretic Charge Filling in Moiré-Reconstructed Helical Trilayer Graphene
Hangyeol Park1,2, Junhyeok Oh1,2, Rasoul Ghadimi1,3
1Department of Physics and Astronomy, Seoul National University, Seoul, South Korea.
Summary
Researchers observed anomalous charge filling in helical trilayer graphene due to complex moiré superlattices. This reveals unique electronic signatures from periodic and aperiodic domains, offering insights into quantum phase control.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Engineering
Background:
- Moiré superlattices in van der Waals heterostructures are key for tuning electronic properties.
- Multi-moiré architectures offer complex electronic landscapes and novel quantum states.
- Interlayer interactions and strain can induce structural reconfigurations, creating periodic and aperiodic domains.
Purpose of the Study:
- To investigate anomalous charge filling in helical trilayer graphene.
- To explore the electronic signatures arising from complex moiré-of-moiré environments.
- To understand the role of spatial inhomogeneity and loss of periodicity in quantum phenomena.
Main Methods:
- Fabrication of helical trilayer graphene with sequential twist angles.
- Transport measurements to probe electronic behavior.
- Analysis of anomalous hysteretic charge filling and dual electronic signatures.
Main Results:
- Observed anomalous hysteretic charge filling in helical trilayer graphene.
- Identified distinct electronic signatures from periodic moiré domains (minibands) and aperiodic boundaries (hysteretic resistance).
- Interpreted results through partial electron localization in the incommensurate regime.
Conclusions:
- Spatially inhomogeneous potentials significantly reshape electronic states.
- Loss of global periodicity in incommensurate regimes drives unique electronic behaviors.
- Provides a pathway for controlling quantum phases in non-periodic lattice environments.
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