Dispersion-Selective Band Engineering in an Artificial Kagome Superlattice
Shuai Wang, Zhen Zhan, Xiaodong Fan, Yonggang Li, Pierre A. Pantaleón, Chaochao Ye, Zhiping He, Laiming Wei, Lin Li, F. Guinea, Shengjun Yuan, Changgan Zeng
Abstract
The relentless pursuit of band structure engineering continues to be a fundamental aspect in solid-state research. Here, we meticulously construct an artificial kagome potential to generate and control multiple Dirac bands of graphene. This unique high-order potential harbors natural multiperiodic components, enabling the reconstruction of band structures through different potential contributions. As a result, the band components, each characterized by distinct dispersions, shift in energy at different velocities in response to the variation of artificial potential. Thereby, we observe a significant spectral weight redistribution of the multiple Dirac peaks. Furthermore, the magnetic field can effectively weaken the superlattice effect and reactivate the intrinsic Dirac band. Overall, we achieve actively dispersion-selective band engineering, a functionality that would substantially increase the freedom in band design.