Entanglement phase transitions in non-Hermitian Floquet systems

• URL: http://arxiv.org/abs/2310.11351v2
• Date: Tue, 23 Apr 2024 00:33:07 GMT
• Title: Entanglement phase transitions in non-Hermitian Floquet systems
• Authors: Longwen Zhou,
• Abstract summary: In this work, we reveal entanglement transitions in the context of non-Hermitian Floquet systems. We find that the monotonic increase of quenched hopping amplitude could flip the system between volume-law and area-law entangled Floquet phases. Our findings build a foundation for exploring entanglement phase transitions in Floquet non-Hermitian setups.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The competition between unitary time-evolution and quantum measurements could induce phase transitions in the entanglement characteristics of quantum many-body dynamics. In this work, we reveal such entanglement transitions in the context of non-Hermitian Floquet systems. Focusing on noninteracting fermions in a representative bipartite lattice with balanced gain/loss and under time-periodic quenches, we uncover rich patterns of entanglement transitions due to the interplay between driving and non-Hermitian effects. Specially, we find that the monotonic increase of quenched hopping amplitude could flip the system between volume-law and area-law entangled Floquet phases, yielding alternated entanglement transitions. Meanwhile, the raise of gain/loss strength could trigger area-law to volume-law reentrant transitions in the scaling behavior of steady-state entanglement entropy, which are abnormal and highly unexpected in non-driven systems. Connections between entanglement transitions and parity-time-reversal (PT) transitions in Floquet spectra are further established. Our findings not only build a foundation for exploring entanglement phase transitions in Floquet non-Hermitian setups, but also provide efficient means to engineer and control such transitions by driving fields.

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