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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Photonics

Background:

  • Tailoring intersite connectivity in lattices is key for novel topological phases.
  • Conventional models like Su-Schrieffer-Heeger are limited to nearest-neighbor couplings.

Purpose of the Study:

  • To experimentally realize photonic dimer chains with tunable long-range hopping.
  • To generalize the Su-Schrieffer-Heeger model with arbitrary hopping strength and phase.
  • To explore topological phase transitions driven by synthetic gauge fields.

Main Methods:

  • Utilizing a synthetic dimension scheme with frequency modes in an optical fiber loop.
  • Directly accessing band dispersion and Bloch wave function geometry.
  • Extracting the winding number for various configurations.

Main Results:

  • Successful creation of photonic dimer chains with controllable long-range hopping.
  • Demonstration of a generalized Su-Schrieffer-Heeger model.
  • Observation of a topological phase transition induced by a synthetic gauge field.

Conclusions:

  • This work provides a versatile platform for engineering topological bands in photonic lattices.
  • The findings offer a route towards novel topological phases of matter.
  • The system belongs to the AIII symmetry class, enabling specific topological properties.