The local physical properties of an isolated quantum statistical system in the stationary state reached long after a quench are generically described by the Gibbs ensemble, which involves only its Hamiltonian and the temperature as a parameter. If the system is instead integrable, additional quantities conserved by the dynamics intervene in the description of the stationary state. The resulting generalized Gibbs ensemble involves a number of temperature-like parameters, the determination of which is practically difficult. Here we argue that in a number of simple models these parameters can be effectively determined by using fluctuation-dissipation relationships between response and correlation functions of natural observables, quantities which are accessible in experiments. ArXIV

Measuring effective temperatures in a generalized Gibbs ensemble / Foini, Laura; Gambassi, Andrea; Konik, Robert; Cugliandolo, Leticia F.. - In: PHYSICAL REVIEW. E. - ISSN 2470-0053. - 95:5(2017), pp. 1-8. [10.1103/PhysRevE.95.052116]

Measuring effective temperatures in a generalized Gibbs ensemble

Gambassi, Andrea;
2017-01-01

Abstract

The local physical properties of an isolated quantum statistical system in the stationary state reached long after a quench are generically described by the Gibbs ensemble, which involves only its Hamiltonian and the temperature as a parameter. If the system is instead integrable, additional quantities conserved by the dynamics intervene in the description of the stationary state. The resulting generalized Gibbs ensemble involves a number of temperature-like parameters, the determination of which is practically difficult. Here we argue that in a number of simple models these parameters can be effectively determined by using fluctuation-dissipation relationships between response and correlation functions of natural observables, quantities which are accessible in experiments. ArXIV
2017
95
5
1
8
052116
https://doi.org/10.1103/PhysRevE.95.052116
https://arxiv.org/abs/1610.00101
Foini, Laura; Gambassi, Andrea; Konik, Robert; Cugliandolo, Leticia F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/47579
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