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Kagome electronic states in gradient-strained untwisted graphene bilayers.

Zeyu Liu1,2,3, Xianghua Kong1, Zewen Wu1

  • 1College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. kongxianghuaphysics@szu.edu.cn.

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Summary

Gradient strain engineering creates moiré superlattices in bilayer graphene, offering a reproducible alternative to twisting. This method reveals tunable kagome electronic bands, paving the way for novel electronic states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Moiré superlattices in twisted bilayer graphene exhibit exotic electronic states like superconductivity and correlated insulators.
  • Fabrication of twisted moiré superlattices often suffers from disorder, impacting reproducibility and control.

Purpose of the Study:

  • To propose and investigate gradient strain as an alternative method for constructing moiré superlattices in untwisted bilayer graphene.
  • To explore the electronic properties and structural characteristics of gradient strain-induced moiré superlattices (gs-BLG).

Main Methods:

  • Utilized force-field and first-principles calculations to model gs-BLG.
  • Analyzed interlayer-spacing distributions and electronic band structures.

Main Results:

  • gs-BLG exhibits kagome-like interlayer-spacing distributions and strain-tunable kagome electronic bands.
  • Three distinct forms of diatomic kagome lattices (subtle, pronounced, distorted) arise from competing strain effects.
  • Kagome electronic bands near the Fermi level were identified, with tunable bandwidths and hopping parameters.

Conclusions:

  • Gradient strain engineering provides a viable and reproducible alternative to twist engineering for creating moiré superlattices.
  • gs-BLG offers a versatile platform for exploring emergent electronic phases and novel quantum phenomena.