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We demonstrate a novel parity-time (PT)-symmetric topological insulator in optical waveguides. This PT-symmetric system exhibits unique topological phases and robust boundary transport despite engineered dissipation.

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Area of Science:

  • Condensed Matter Physics
  • Topological Materials
  • Non-Hermitian Systems

Background:

  • Parity-time (PT) symmetry offers a route to engineer novel quantum phenomena in open systems.
  • Topological insulators possess unique boundary states protected by topology.
  • Combining PT symmetry with topological phases in non-Hermitian systems remains challenging.

Purpose of the Study:

  • To propose and experimentally realize a PT-symmetric bimorphic topological insulator.
  • To investigate the coexistence of first- and second-order topological phases.
  • To explore the stabilization of topological boundary modes in dissipative systems.

Main Methods:

  • Implementation of an anomalous Floquet model in a 2D optical waveguide array.
  • Utilizing a four-step driving protocol with spatiotemporally engineered loss to maintain PT symmetry.
  • Observing edge transport and corner localization phenomena.

Main Results:

  • Experimental realization of a PT-symmetric bimorphic topological insulator.
  • Demonstration of a purely real quasienergy spectrum due to PT symmetry, stabilizing boundary modes.
  • Observation of unidirectional edge transport and robust corner localization, confirming the non-Hermitian bimorphic phase.

Conclusions:

  • The study successfully demonstrates a PT-symmetric topological insulator in an open quantum system.
  • Findings highlight the role of PT symmetry in stabilizing topological states against dissipation.
  • Opens avenues for exploring PT-symmetric and non-Hermitian topological phases in complex regimes.