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Quantum quenches in the Dicke model:Thermalization and failure of the generalized gibbs ensemble

Chinese Physics B 2020年第12期29卷 198-204页

作者： Xiao-Qiang Su You-Quan Zhao College of Physics and Information Engineering ShanXi Normal UniversityLinfen 041004China

Quantum quenches in the Dicke model were studied both in the thermodynamic limit and the finite *** the integrable situation in the thermodynamic limit,the generalized gibbs ensemble can effectively describe the energylevel occupations for the quench within the normal phase,but it fails for the quench to the superradiant *** the finite systems which are considered non-integrable,the post quench systems were studied by comparing with the thermal *** canonical ensembles are directly available for the quench within the normal *** the increasing of the target coupling strength over the equilibrium phase transition critical point,sudden changes take place for the effective temperature and the distance to the thermal *** thermalization was also studied by comparing with the results of the microcanonical ensembles.

关键词： quantum quench generalized gibbs ensemble thermalization Dicke model

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Fluctuation relations for heat exchange in the generalized gibbs ensemble

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Frontiers of physics 2018年第5期13卷 213-220页

作者： Bo-Bo Wei School of Physics and Energy Shenzhen University Shenzhen 518060 China

In this work, we investigate the heat exchange between two quantum systems whose initial equilibrium states are described by the generalized gibbs ensemble. First, we generalize the fluctuation relations for heat exchange discovered by Jarzynski and Wojcik to quantum systems prepared in the equilibrium states described by the generalized gibbs ensemble at various generalized temperatures. Secondly, we extend the connections between heat exchange and the Renyi divergences to quantum systems under generic initial conditions. These relations are applicable for quantum systems with conserved quantities and universally valid for quantum systems in the integrable and chaotic regimes.

关键词： exchange fluctuation relation generalized gibbs ensemble

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Thermalization of one-dimensional classical lattices:beyond the weakly interacting regime

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Communications in Theoretical Physics 2024年第11期76卷 135-144页

作者： Zhen Wang Weicheng Fu Yong Zhang Hong Zhao CAS Key Laboratory of Theoretical Physics and Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Department of Physics Xiamen UniversityXiamen 361005China Department of Physics Tianshui Normal UniversityTianshui 741001China Lanzhou Center for Theoretical Physics and Key Laboratory of Theoretical Physics of Gansu Province Lanzhou UniversityLanzhou 730000China

Thermalization in many-body systems,especially with strong interactions,is a central question in *** this work,we present a novel framework for the thermalization of interacting wave systems,distinguishing between trivial(no momentum exchange)and nontrivial interactions(significant energy redistribution).This distinction leads to a statistically equivalent model with weakened *** applying this to FPUT-like models,we identify a unique double scaling of thermalization ***,our findings suggest the persistence of prethermalization in strong interactions.

关键词： thermalization energy diffusion lattice model strong interaction prethermalization generalized gibbs ensemble multi-wave resonances

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