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Higher-Order Weyl-Exceptional-Ring Semimetals.

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|November 19, 2021
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This summary is machine-generated.

Researchers discovered a new higher-order topological semimetal featuring Weyl exceptional rings. This novel material exhibits unique surface and hinge Fermi arcs, opening new avenues in non-Hermitian topological physics.

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Area of Science:

  • Condensed matter physics
  • Topological materials science
  • Quantum mechanics

Background:

  • First-order topological semimetals can host Weyl nodes.
  • Non-Hermitian perturbations transform Weyl nodes into Weyl exceptional rings.
  • Higher-order Weyl semimetals exhibit coexisting surface and hinge Fermi arcs.

Purpose of the Study:

  • To explore non-Hermitian higher-order topological semimetals.
  • To identify novel topological semimetals with Weyl exceptional rings.
  • To investigate the topological properties and surface/hinge states of these new materials.

Main Methods:

  • Theoretical identification of a new topological semimetal phase.
  • Characterization of Weyl exceptional rings using spectral winding and Chern numbers.
  • Analysis of surface and hinge Fermi-arc states.

Main Results:

  • Discovery of a higher-order topological semimetal with Weyl exceptional rings.
  • These rings are characterized by spectral winding and Chern numbers.
  • The material supports both surface and hinge Fermi-arc states bounded by projected rings.
  • Dissipative terms can induce topological phase transitions via ring coupling.

Conclusions:

  • This work introduces a new class of non-Hermitian topological semimetals.
  • The findings expand the understanding of topological phases in non-Hermitian systems.
  • The identified material offers a platform for exploring novel topological phenomena.