Probing nonthermal density fluctuations in the onedimensional Bose gas
Quantum integrable models display a rich variety of nonthermal excited states with unusual properties. The most common way to probe them is by performing a quantum quench, i.e., by letting a manybody initial state unitarily evolve with an integrable Hamiltonian. At late times these systems are locally described by a generalized Gibbs ensemble with as many effective temperatures as their local conserved quantities. The experimental measurement of this macroscopic number of temperatures remains elusive. Here we show that they can be obtained for the Bose gas in one spatial dimension by probing the dynamical structure factor of the system after the quench and by employing a generalized fluctuationdissipation theorem that we provide. Our procedure allows us to completely reconstruct the stationary state of a quantum integrable system from stateoftheart experimental observations.
 Authors:

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 French National Centre for Scientific Research, École Normale Supérieure
 University of Warsaw
 National Institute of Nuclear Physics (at SISSA)
 Laboratory of Theoretical and High Energy Physics
 Brookhaven National Laboratory
 École Normale Supérieure
 Publication Date:
 Grant/Contract Number:
 AC0298CH10886
 Type:
 Published Article
 Journal Name:
 SciPost Physics
 Additional Journal Information:
 Journal Name: SciPost Physics Journal Volume: 3 Journal Issue: 3; Journal ID: ISSN 25424653
 Publisher:
 Stichting SciPost
 Sponsoring Org:
 USDOE
 Country of Publication:
 Country unknown/Code not available
 Language:
 English
 OSTI Identifier:
 1395184
De Nardis, Jacopo, Panfil, Milosz, Gambassi, Andrea, Cugliandolo, Leticia, Konik, Robert, and Foini, Laura. Probing nonthermal density fluctuations in the onedimensional Bose gas. Country unknown/Code not available: N. p.,
Web. doi:10.21468/SciPostPhys.3.3.023.
De Nardis, Jacopo, Panfil, Milosz, Gambassi, Andrea, Cugliandolo, Leticia, Konik, Robert, & Foini, Laura. Probing nonthermal density fluctuations in the onedimensional Bose gas. Country unknown/Code not available. doi:10.21468/SciPostPhys.3.3.023.
De Nardis, Jacopo, Panfil, Milosz, Gambassi, Andrea, Cugliandolo, Leticia, Konik, Robert, and Foini, Laura. 2017.
"Probing nonthermal density fluctuations in the onedimensional Bose gas". Country unknown/Code not available.
doi:10.21468/SciPostPhys.3.3.023.
@article{osti_1395184,
title = {Probing nonthermal density fluctuations in the onedimensional Bose gas},
author = {De Nardis, Jacopo and Panfil, Milosz and Gambassi, Andrea and Cugliandolo, Leticia and Konik, Robert and Foini, Laura},
abstractNote = {Quantum integrable models display a rich variety of nonthermal excited states with unusual properties. The most common way to probe them is by performing a quantum quench, i.e., by letting a manybody initial state unitarily evolve with an integrable Hamiltonian. At late times these systems are locally described by a generalized Gibbs ensemble with as many effective temperatures as their local conserved quantities. The experimental measurement of this macroscopic number of temperatures remains elusive. Here we show that they can be obtained for the Bose gas in one spatial dimension by probing the dynamical structure factor of the system after the quench and by employing a generalized fluctuationdissipation theorem that we provide. Our procedure allows us to completely reconstruct the stationary state of a quantum integrable system from stateoftheart experimental observations.},
doi = {10.21468/SciPostPhys.3.3.023},
journal = {SciPost Physics},
number = 3,
volume = 3,
place = {Country unknown/Code not available},
year = {2017},
month = {9}
}