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.
Uhlmann, On Berry phases along mixtures of states, Annalen der Physik50, 63 (1989)
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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.