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Article Dans Une Revue J.Stat.Mech. Année : 2021

Non-equilibrium dynamics of the open quantum O(n)-model with non-Markovian noise: exact results

Sascha Wald
  • Fonction : Auteur
Malte Henkel
Andrea Gambassi
  • Fonction : Auteur

Résumé

The collective and purely relaxational dynamics of quantum many-body systems after a quench at temperature T = 0, from a disordered state to various phases is studied through the exact solution of the quantum Langevin equation of the spherical and the O(n)-model in the limit n → ∞. The stationary state of the quantum dynamics is shown to be a non-equilibrium state. The quantum spherical and the quantum O(n)-model for n → ∞ are in the same dynamical universality class. The long-time behaviour of single-time and two-time correlation and response functions is analysed and the universal exponents which characterise quantum coarsening and quantum ageing are derived. The importance of the non-Markovian long-time memory of the quantum noise is elucidated by comparing it with an effective Markovian noise having the same scaling behaviour and with the case of non-equilibrium classical dynamics.

Dates et versions

hal-03273414 , version 1 (29-06-2021)

Identifiants

Citer

Sascha Wald, Malte Henkel, Andrea Gambassi. Non-equilibrium dynamics of the open quantum O(n)-model with non-Markovian noise: exact results. J.Stat.Mech., 2021, 2110, pp.103105. ⟨10.1088/1742-5468/ac25f6⟩. ⟨hal-03273414⟩
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