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Switching between topological edge states in plasmonic systems using phase-change materials.

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    We developed novel non-Hermitian plasmonic waveguide-cavity structures. These structures enable switching between right and left topological edge states (TESs) using a phase-change material.

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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Topological edge states (TESs) offer robust transport properties.
    • Non-Hermitian systems exhibit unique phenomena not found in their Hermitian counterparts.
    • Phase-change materials provide dynamic control over optical properties.

    Purpose of the Study:

    • To realize dynamic switching between right and left topological edge states (TESs).
    • To utilize the phase-change material Ge$_{2}$Sb$_{2}$Te$_{5}$ (GST) for reconfigurable topological photonic devices.
    • To investigate non-Hermitian plasmonic waveguide-cavity structures based on the Aubry-Andre-Harper model.

    Main Methods:

    • Designing non-Hermitian plasmonic waveguide-cavity structures.
    • Employing the Aubry-Andre-Harper model for theoretical analysis.
    • Utilizing Ge$_{2}$Sb$_{2}$Te$_{5}$ (GST) as a phase-change material to tune optical properties.

    Main Results:

    • Demonstrated switching between right and left TESs at the same frequency.
    • Showcased that phase transitions in GST shift the dispersion relation.
    • Achieved reconfigurable topological states by switching GST between crystalline and amorphous phases.

    Conclusions:

    • Successfully realized reconfigurable topological edge states using phase-change materials.
    • The proposed structures are promising for compact and tunable topological photonic devices.
    • This work opens avenues for advanced optical functionalities in reconfigurable topological photonics.