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A generic phase between disordered Weyl semimetal and diffusive metal.

Ying Su1,2, X S Wang1,3, X R Wang4,5

  • 1Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Scientific Reports
|November 1, 2017
PubMed
Summary
This summary is machine-generated.

Disorder in Weyl semimetals (WSMs) creates an intermediate Chern insulator (CI) phase, not a direct transition to a diffusive metal (DM). This finding impacts understanding of quantum phase transitions and Anderson localization in 3D materials.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Weyl semimetals (WSMs) are topological materials with unique electronic properties.
  • Understanding the effects of disorder on WSMs is crucial for their technological applications.

Purpose of the Study:

  • Investigate quantum phase transitions in 3D WSMs under disorder.
  • Clarify the nature of transitions between WSM, Chern insulator (CI), and diffusive metal (DM) phases.

Main Methods:

  • Quantum conductance calculations.
  • Finite-size scaling of localization length.
  • Analysis of critical exponents and Hall conductances.

Main Results:

  • An intermediate CI phase exists between WSM and DM phases due to internode scattering.
  • The WSM-CI and CI-DM transitions share a critical exponent (ν ≈ 1.3) within the 3D Gaussian unitary ensemble universality class.
  • Quantized Hall conductances confirm the CI phase, and disorder-induced transitions are explained by the self-consistent Born approximation.

Conclusions:

  • The existence of an intermediate CI phase is robust.
  • Zero density of states at Weyl nodes is not a reliable indicator of disordered WSMs.
  • The hypothesis of diverging localization length at the WSM-DM transition is unfounded.