Fractional winding numbers in open quantum systems recover integer quantization over multiple momentum periods.
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A periodically driven dissipative SSH chain exhibits a Z x Z topological classification in its mixed steady state via ensemble geometric phases in the 0 and pi gaps.
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Fractional topology and multi-period re-quantization in open quantum systems
Fractional winding numbers in open quantum systems recover integer quantization over multiple momentum periods.
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Anomalous Mixed-State Floquet Topology in One-Dimensional Open Quantum Systems
A periodically driven dissipative SSH chain exhibits a Z x Z topological classification in its mixed steady state via ensemble geometric phases in the 0 and pi gaps.