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Three-Dimensional Dirac Phonons with Inversion Symmetry.

Z J Chen1,2,3, R Wang4, B W Xia2,3

  • 1Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China.

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|May 21, 2021
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Summary
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Researchers have discovered three-dimensional (3D) Dirac phonons in crystalline solids, a novel phenomenon distinct from electronic Dirac fermions. This finding guides the exploration of Dirac bosons in phononic and photonic systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Dirac semimetals, characterized by bulk Dirac fermions, are established in topological electronic systems.
  • Three-dimensional (3D) Dirac phonons in crystalline solids have remained elusive until now.

Purpose of the Study:

  • To systematically investigate the existence and properties of 3D Dirac phonons in crystalline solids.
  • To identify the symmetry mechanisms responsible for the emergence of 3D Dirac phonons.

Main Methods:

  • Employing symmetry arguments to analyze potential Dirac phonon occurrences.
  • Utilizing first-principles calculations to examine all space groups with inversion symmetry.

Main Results:

  • Two distinct categories of 3D Dirac phonons were identified based on protection mechanisms and momentum space locations.
  • The first category arises from four-dimensional irreducible representations at high symmetry points.
  • The second category results from phonon branch inversion, with Dirac points situated along high symmetry lines.

Conclusions:

  • Nonsymmorphic symmetries and combined inversion-time-reversal symmetries are crucial for 3D Dirac phonons.
  • This work provides a comprehensive understanding and guidance for discovering Dirac bosons in phononic and photonic systems.