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Photonic axion insulator.

Gui-Geng Liu1,2, Subhaskar Mandal1, Xiang Xi3

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Summary
This summary is machine-generated.

Researchers created a three-dimensional axion insulator, a novel topological phase of matter. This breakthrough enables exploration of unique topological properties and chiral states in three dimensions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Physics

Background:

  • Axions are hypothetical elementary particles.
  • Axion insulators are crystalline materials exhibiting axion properties.
  • Previous axion insulator research focused on 2D systems, limiting 3D topological exploration.

Purpose of the Study:

  • To experimentally realize and investigate a three-dimensional (3D) axion insulator.
  • To explore the unique topological properties of 3D axion insulators.
  • To enable the study of topological transport in 3D systems.

Main Methods:

  • Fabrication of a 3D photonic crystal acting as an axion insulator.
  • Experimental probing of the crystal's topological properties.
  • Observation of surface and hinge states.

Main Results:

  • Demonstration of half-quantized Chern numbers on surfaces, mimicking fractional Chern insulators.
  • Observation of unidirectional chiral hinge states enabling 3D topological transport.
  • Experimental evidence of arithmetic operations between fractional and integer Chern numbers.

Conclusions:

  • The study experimentally establishes the axion insulator as a viable 3D topological phase of matter.
  • The research enables the formation of complex, unidirectional 3D chiral networks through braiding.
  • This work opens new avenues for exploring topological phenomena in three dimensions.