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Dispersion-Selective Band Engineering in an Artificial Kagome Superlattice

Shuai Wang1,2,*, Zhen Zhan3,4,*, Xiaodong Fan1,2,*,†, Yonggang Li3, Pierre A. Pantaleón4, Chaochao Ye1,2, Zhiping He1, Laiming Wei5, Lin Li1,2,6 et al.

Francisco Guinea4,7,‡, Shengjun Yuan3,8,§, and Changgan Zeng1,2,6,∥

  • *These authors contributed equally to this letter.
  • †Contact author: fanxd@ustc.edu.cn
  • ‡Contact author: paco.guinea@imdea.org
  • §Contact author: s.yuan@whu.edu.cn
  • ∥Contact author: cgzeng@ustc.edu.cn

Phys. Rev. Lett. 133, 066302 – Published 6 August, 2024

DOI: https://doi.org/10.1103/PhysRevLett.133.066302

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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synopsis

Electronic Bands Get a New Tuning Knob

Published 6 August, 2024

Researchers have used a specially crafted electric potential to manipulate the electronic band structure of graphene, laying the groundwork for on-demand electronic band design.

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