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arXiv · 2509.10930

Correlated interlayer quantum Hall state in large-angle twisted trilayer graphene

Dohun Kim·Gyeoul Lee·Nicolas Leconte·Seyoung Jin·Takashi Taniguchi·Kenji Watanabe·Jeil Jung·Gil Young Cho·Youngwook Kim
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Abstract

Trilayer graphene allows systematic control of its electronic structure through stacking sequence and twist geometry, providing a versatile platform for correlated states. Here we report magnetotransport in alternating twisted trilayer graphene with a twist angle of about 5$^{\circ}$. The data reveal an electron-hole asymmetry that can be captured by introducing layer-dependent potential shifts. At charge neutrality ($ν_{\mathrm{tot}}=0$), three low-resistance states appear, which Hartree-Fock mean-field analysis attributes to emerging spin-resolved helical edge modes similar to those of quantum spin Hall insulators. At $ν_{\mathrm{tot}}=-1$, 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 quantum Hall state. These results demonstrate correlated interlayer quantum Hall phases in alternating twisted trilayer graphene, including spin-resolved edge transport and excitonic order.

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Dohun Kim, Gyeoul Lee, Nicolas Leconte, Seyoung Jin, Takashi Taniguchi, Kenji Watanabe, Jeil Jung, Gil Young Cho, Youngwook Kim. 2025-12-23. Correlated interlayer quantum Hall state in large-angle twisted trilayer graphene. https://doi.org/10.1021/acs.nanolett.5c04989

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