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Symmetry-Protected Topological Triangular Weyl Complex.

R Wang1,2, B W Xia1, Z J Chen1,3

  • 1Department of Physics & Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China.

Physical Review Letters
|March 29, 2020
PubMed
Summary
This summary is machine-generated.

This study reveals novel single and double Weyl phonons in triangular lattices, forming unique Weyl complexes. These findings challenge conventional understanding and offer new pathways for exploring Weyl bosons in phononic and photonic systems.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state physics

Background:

  • Weyl points, typically found in pairs with opposite chirality, are fundamental to topological phenomena.
  • Understanding the behavior and formation of Weyl points in different lattice structures is crucial for topological material design.

Purpose of the Study:

  • To investigate the existence and properties of unconventional Weyl points in phononic systems.
  • To analyze the formation of a unique triangular Weyl complex in realistic materials with trigonal or hexagonal lattices.
  • To explore the characteristics of surface states and arcs associated with these novel Weyl points.

Main Methods:

  • First-principles calculations to simulate material properties.
  • Symmetry analysis to understand the underlying physical principles.
  • Phonon band structure calculations to identify Weyl points and their dispersions.

Main Results:

  • Simultaneous presence of single (linear dispersion) and double (quadratic dispersion) Weyl phonons.
  • Formation of a unique triangular Weyl complex at high-symmetry points due to screw rotational symmetry.
  • Unconventional phonon surface arcs connecting one double and two single Weyl points, spanning the entire surface Brillouin zone.
  • Observation of nontrivial phonon surface states across the isofrequency surface.

Conclusions:

  • The study introduces a novel triangular phonon Weyl complex, distinct from conventional Weyl systems.
  • The long and extensive phonon surface arcs facilitate experimental detection and potential applications.
  • Provides a theoretical framework and experimental guidance for exploring triangular Weyl bosons in phononic and photonic systems.