Abstract
While transition-metal dichalcogenide (TMD)-based moirématerials have been shown to host various correlated electronic phenomena, topological states have not been experimentally observed until now [T. Li et al., Quantum anomalous Hall effect from intertwined moirébands. arXiv [Preprint] (2021). https://arxiv.org/abs/2107.01796 (Accessed 5 July 2021)]. In this work, using first-principle calculations and continuum modeling, we reveal the displacement field-induced topologicalmoirébands in AB-stacked TMD heterobilayer MoTe2/WSe2. Valley-contrasting Chern bands with nontrivial spin texture are formed from interlayer hybridization between MoTe2 and WSe2 bands of nominally opposite spins. 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.
| Original language | English |
|---|---|
| Article number | e2112673118 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Volume | 118 |
| Issue number | 36 |
| DOIs | |
| State | Published - Sep 7 2021 |
Funding
ACKNOWLEDGMENTS. We thank Kin Fai Mak, Jie Shan, Tingxin Li, and Shengwei Jiang for collaboration on a parallel experimental work. Y.Z. thanks Yan Sun and Claudia Felser for providing the computational resources at the Max Planck Computing & Data Facility Raven cluster. This work is primarily supported by Department of Energy Office of Basic Energy Sciences, Division of Materials Sciences and Engineering Awards DE-SC0018945 (theoretical modeling) and DE-SC0020149 (band-structure calculation). L.F. is partly supported by a Simons Investigator award from the Simons Foundation and the David and Lucile Packard Foundation.
Keywords
- Continuum model
- First principle simulation
- Moiré superlattice
- Topological bands