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Dispersion-Selective Band Engineering in an Artificial Kagome Superlattice
Shuai Wang1,2, Zhen Zhan3,4, Xiaodong Fan1,2
1CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, <a href="https://ror.org/04c4dkn09">University of Science and Technology of China</a>, Hefei, Anhui 230026, China.
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.
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