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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Three-dimensional layered materials can exhibit topological properties like Chern insulator or Weyl semimetal phases in their clean limit.
  • The behavior of these topological phases under disorder is crucial for understanding their practical applications and fundamental physics.
  • Disorder can drive phase transitions, potentially leading to novel metallic states not present in the clean system.

Purpose of the Study:

  • To investigate the impact of disorder on a three-dimensional layered Chern insulator system.
  • To identify and characterize distinct metallic phases that emerge between Anderson insulator and Chern insulator regimes.
  • To explore the nature of the phase transition and the critical phenomena involved.

Main Methods:

  • Utilized the transfer matrix method to calculate the localization length, a key indicator of electronic localization.
  • Calculated electrical conductance to probe the transport properties of the emergent metallic phases.
  • Analyzed the density of states to further characterize the electronic structure and distinguish between different metallic phases.

Main Results:

  • Identified two distinct metallic phases: a diffusive metallic phase and a renormalized Weyl semimetal phase.
  • These metallic phases exist between the Anderson insulator and the pristine Chern insulator states.
  • Revealed a quantum critical line separating these two metallic phases, indicating a critical transition.

Conclusions:

  • Disorder in 3D layered Chern insulators leads to the emergence of novel metallic phases beyond the clean limit predictions.
  • The interplay between topology and disorder is complex, giving rise to renormalized topological semimetal states.
  • The identified quantum critical line suggests rich critical behavior and potential for new quantum phenomena.