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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanoscience

Background:

  • Topological electronic edge states emerge at AB-BA interfaces in biased twisted bilayer graphene.
  • Plasmons in gapped graphene systems are crucial for understanding collective electronic excitations.

Purpose of the Study:

  • Investigate the properties of plasmons in biased twisted bilayer graphene with the Fermi level within the gap.
  • Characterize the network of chiral edge plasmons (CEPs) and their unique spectral features.

Main Methods:

  • Analysis of collective excitations within the topological electronic edge states.
  • Derivation of plasmon spectra from the dielectric matrix.
  • Development of a network model for plasmon band antisymmetry and scattering.

Main Results:

  • Identified a hexagonal network of chiral edge plasmons (CEPs) with a unique energy scale.
  • Observed a diverging density of states at zero energy and a plasmonic Dirac cone at ħω∼εp/2.
  • Demonstrated maximal scattering of CEPs at hexagon vertices into deflected chiral directions.

Conclusions:

  • Biased twisted bilayer graphene hosts a novel network of chiral edge plasmons.
  • The plasmonic Dirac cone and its broken symmetry phases are potentially observable via scanning near-field microscopy.