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∘. The data reveal an electron-hole asymmetry that can be captured by introducing layer-dependent potential shifts. At charge neutrality (νtot=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 νtot=−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.
@article{arxiv.2509.10930,
title = {Correlated interlayer quantum Hall state in large-angle twisted trilayer graphene},
author = {Dohun Kim and Gyeoul Lee and Nicolas Leconte and Seyoung Jin and Takashi Taniguchi and Kenji Watanabe and Jeil Jung and Gil Young Cho and Youngwook Kim},
journal= {arXiv preprint arXiv:2509.10930},
year = {2026}
}