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Domain-Selective 1D Moiré Engineering and Topological Transitions in Bilayer Graphene.

Laiyuan Su1, Yifan Gao1, Yongdao Chen1

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Engineers can control electronic topology using one-dimensional (1D) moiré superlattices. This method enables domain-level control over quantum phases in van der Waals heterostructures.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) moiré superlattices offer a platform for novel electronic states.
  • Engineering electronic topology and correlated states requires advanced material design.
  • Heterostrain is a key method for manipulating moiré superlattices.

Purpose of the Study:

  • To explore the potential of one-dimensional (1D) moiré superlattices generated via heterostrain.
  • To demonstrate domain-level control over low-energy electronic properties.
  • To investigate the impact of strain on band gaps and electronic transitions.

Main Methods:

  • Atomistic tight-binding simulations were employed.
  • Heterostrain was applied in specific directions to 1D moiré structures.
  • Electronic properties, band gaps, and Fermi surface reconstructions were analyzed.

Main Results:

  • Heterostrain eliminated metallic AA-stacking regions and induced robust band gaps.
  • The system exhibited insulator-metal-insulator transitions as strain decreased.
  • Dirac cone formation occurred at a critical strain (ηc = 1.818%), accompanied by Fermi surface reconstructions and sign reversals in Berry curvature.

Conclusions:

  • Domain-selective 1D moiré engineering is a powerful approach for controlling quantum phases.
  • This method offers precise control over low-energy physics and topology in van der Waals heterostructures.
  • Findings pave the way for novel electronic devices and quantum technologies.