Correlated Interlayer Quantum Hall State in Large-Angle Twisted Trilayer Graphene.
basic_science · Level V
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- Record sourced from PubMed, PMID 41446919.
- Also identified by DOI 10.1021/acs.nanolett.5c04989.
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Abstract
Trilayer graphene offers systematic control of its electronic structure through the stacking sequence and twist geometry, providing a versatile platform for correlated states. Here we report magnetotransport in a large-angle twisted trilayer graphene with a twist angle of about 5°. The data reveal an electron-hole asymmetry that can be captured by introducing layer-dependent potential shifts. At charge neutrality (ν<sub>tot</sub> = 0), three low-resistance states appear, which Hartree-Fock mean-field analysis attributes to spin-resolved helical edge modes in the quantum Hall regime, analogous to quantum spin Hall-like configurations. At ν<sub>tot</sub> = -1, we also observe suppressed resistance when the middle and bottom layers are each half filled, while the top layer remains inert at ν = -2, consistent with an interlayer excitonic phase in the quantum Hall regime. These results demonstrate correlated interlayer quantum Hall phases in large-angle twisted trilayer graphene by combining spin-resolved helical edge transport with excitonic order.