Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers
Abstract
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 Mo T e 2/WS e 2. Valley-contrasting Chern bands with nontrivial spin texture are formed from interlayer hybridization between Mo T e 2 and WS 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.
- Publication:
-
Proceedings of the National Academy of Science
- Pub Date:
- September 2021
- DOI:
- 10.1073/pnas.2112673118
- arXiv:
- arXiv:2107.02167
- Bibcode:
- 2021PNAS..11812673Z
- Keywords:
-
- moiré superlattice;
- topological bands;
- first principle simulation;
- continuum model;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 6 pages, 6 figures. Accepted at PNAS