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Two-Dimensional Dirac Semimetals without Inversion Symmetry.

Y J Jin1,2, B B Zheng3, X L Xiao1,4

  • 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
|September 25, 2020
PubMed
Summary
This summary is machine-generated.

Stable two-dimensional Dirac points with spin-orbit coupling are realized without inversion symmetry. This discovery enables the study of exotic transport phenomena in 2D topological semimetals.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Materials

Background:

  • Stable two-dimensional (2D) Dirac points are crucial for exploring unique transport properties.
  • Previous studies required both inversion and time-reversal symmetries, leading to vanishing Berry curvature and edge states.

Purpose of the Study:

  • To investigate the possibility of stable 2D Dirac points in the presence of spin-orbit coupling (SOC) without relying on inversion symmetry.
  • To identify new classes of 2D topological semimetals with observable characteristics.

Main Methods:

  • Utilized tight-binding models and k·p effective Hamiltonian theory.
  • Employed symmetry arguments and high-throughput first-principles calculations.

Main Results:

  • Demonstrated that 2D Dirac points can exist with SOC when inversion symmetry is absent.
  • Observed nonzero Berry curvature near Dirac nodes and identified two edge states per Dirac point pair.
  • Identified a family of ideal 2D Dirac semimetals with observable Berry curvature and edge states.

Conclusions:

  • 2D Dirac points can emerge without inversion symmetry, expanding the classification of 2D topological semimetals.
  • The identified materials provide a promising platform for observing exotic transport phenomena beyond graphene, such as the nonlinear Hall effect.