2025/04/25 by Simon Kothe, Oliver, Christopher, Kothe, Simon +2 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Quantum Gases (cond-mat.quant-gas) #Quantum Mechanics and Non-Hermitian Physics #Quantum Physics (quant-ph) #Quantum many-body systems
paper · pdf · doi:10.48550/arxiv.2504.18426
openalex publication_date 2025/04/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The open Lipkin-Meshkov-Glick (LMG) model provides a prototype of a dissipative phase transition which can be analyzed using mean-field theory. By combining the physics of this model with those of a quantum analogue of a parity-time reversal symmetry breaking transition we analyze the steady state phase diagram of a pair of coupled LMG models. Their competition generates a complex phase diagram with multiple steady-state phases and emergent dynamical regimes absent from either constituent model, including chaos characterized by the maximum Lyapunov exponent. We show that the effects predicted from mean-field theory survive in the full quantum model.