Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers
2021; National Academy of Sciences; Volume: 118; Issue: 36 Linguagem: Inglês
10.1073/pnas.2112673118
ISSN1091-6490
AutoresYang Zhang, Trithep Devakul, Liang Fu,
Tópico(s)Graphene research and applications
ResumoSignificance The long-wavelength moiré superlattices in twisted two-dimensional (2D) structures have emerged as a highly tunable platform for strongly correlated electron physics. In this work, we reveal the displacement field–induced topological moiré bands in AB-stacked transition-metal dichalcogenide (TMD) heterobilayer M o T e 2 / W S e 2 . Valley-contrasting Chern bands with nontrivial spin texture are formed from interlayer hybridization between M o T e 2 and W S e 2 bands of nominally opposite spins. The general mechanism for band inversion we uncovered in AB-stacked TMD bilayers is quite robust and can be applied to other material combinations as well. Our study establishes a recipe for creating topological bands in AB-stacked TMD bilayers in general, which provides a highly tunable platform for realizing quantum-spin Hall and interaction-induced quantum anomalous Hall effects.
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