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Dirac node lines in two-dimensional Lieb lattices.

Bo Yang1, Xiaoming Zhang, Mingwen Zhao

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Summary
This summary is machine-generated.

Researchers propose a new 2D Dirac node line (DNL) semimetal model using a tight-binding approach. Candidate materials Be2C and BeH2 monolayers exhibit robust topological properties and high Fermi velocities, advancing quantum matter research.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum matter

Background:

  • Dirac node line (DNL) semimetals represent a novel quantum matter phase.
  • DNLs, characterized by linear band crossings, have been primarily predicted in 3D materials.

Purpose of the Study:

  • To propose a theoretical model for two-dimensional (2D) DNL semimetals.
  • To identify potential 2D materials exhibiting DNL characteristics.

Main Methods:

  • Development of a tight-binding (TB) model using pz + px,y or pz + s orbitals on a 2D Lieb lattice.
  • Utilizing first-principles calculations to verify theoretical predictions.

Main Results:

  • The proposed TB model successfully describes 2D DNL semimetals robust against spin-orbit interaction.
  • Candidate materials Be2C and BeH2 monolayers were identified with Fermi circles at specific high-symmetry points.
  • These materials exhibit Fermi velocities exceeding that of graphene.
  • A non-zero Z2 topological invariant and associated edge states were confirmed.

Conclusions:

  • The study presents a viable pathway for designing 2D DNL semimetals.
  • Identified materials offer promising platforms for exploring novel quantum phenomena.