In a two-parameter family of quadratic bosonic Hamiltonians from a modified bosonic SSH model, topological phase transitions occur along lines of Krein collisions and topological classification holds in both stable and unstable regimes via symplectic Berry phase and index theory.
Okuma \ and\ author M
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A coefficient-based approach derives analytical phase boundaries and higher winding numbers in 1D non-Hermitian topological superconductors, verified via open-boundary spectra and disorder stability.
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Decoupling band topology from criticality in bosonic systems
In a two-parameter family of quadratic bosonic Hamiltonians from a modified bosonic SSH model, topological phase transitions occur along lines of Krein collisions and topological classification holds in both stable and unstable regimes via symplectic Berry phase and index theory.
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Higher-winding phases in one-dimensional non-Hermitian topological superconductors
A coefficient-based approach derives analytical phase boundaries and higher winding numbers in 1D non-Hermitian topological superconductors, verified via open-boundary spectra and disorder stability.