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Three-dimensional photonic topological insulator without spin-orbit coupling.

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Topological insulators exhibit unique electronic properties protected by time-reversal symmetry.
  • Photonic topological insulators (PTIs) emulate topological insulator properties using light.
  • Existing PTIs often require spin-orbit coupling and struggle with surface state localization.

Purpose of the Study:

  • To design and demonstrate a 3D PTI that overcomes limitations of spin-orbit coupling.
  • To achieve self-guided topological surface states on the exterior surface of a PTI.
  • To explore a new paradigm for topological photonics without spin-orbit coupling.

Main Methods:

  • Theoretical design of a 3D PTI based on a topological crystalline insulator model without spin-orbit coupling.
  • Fabrication and experimental validation using microwave measurements.
  • Analysis of surface state dispersion and localization.

Main Results:

  • Demonstration of a 3D PTI with topological surface states localized on its outer surface.
  • Observation of a unique quadratic dispersion relation for the topological surface states, distinct from linear Dirac cones.
  • Successful emulation of topological properties without relying on spin-orbit coupling.

Conclusions:

  • The developed 3D PTI offers a robust platform for topological photonics with self-guided surface states.
  • Abolishing spin-orbit coupling provides a new route to engineer PTIs with enhanced control.
  • This work paves the way for advanced topological manipulation of light at the surface of photonic bandgap materials.