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Correlated Interlayer Quantum Hall State in Large-Angle Twisted Trilayer Graphene
Dohun Kim1, Gyeoul Lee2, Nicolas Leconte3
1Department of Physics and Chemistry, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea.
Nano Letters
|December 25, 2025
Summary
Large-angle twisted trilayer graphene exhibits unique electronic states. Researchers observed quantum Hall phases, including spin-resolved helical edge modes and interlayer excitonic phases, showcasing tunable correlated states.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Trilayer graphene allows electronic structure control via stacking and twist geometry.
- This tunability makes it a promising platform for exploring correlated electronic states.
Purpose of the Study:
- Investigate magnetotransport properties of large-angle twisted trilayer graphene.
- Identify and characterize novel correlated states in this system.
Main Methods:
- Fabrication of large-angle twisted trilayer graphene (twist angle ~5°).
- Magnetotransport measurements to probe electronic behavior.
- Hartree-Fock mean-field analysis to interpret observed phenomena.
Main Results:
- Observed electron-hole asymmetry, explained by layer-dependent potential shifts.
- At charge neutrality (νtot = 0), three low-resistance states emerged, attributed to spin-resolved helical edge modes.
- At νtot = -1, suppressed resistance indicated an interlayer excitonic phase, consistent with quantum Hall regime behavior.
Conclusions:
- Demonstrated correlated interlayer quantum Hall phases in twisted trilayer graphene.
- Combined spin-resolved helical edge transport with excitonic order.
- Highlights the potential of twisted trilayer graphene for novel quantum phenomena.
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