Probing non-thermal density fluctuations in the one-dimensional Bose gas

De Nardis, Jacopo; Panfil, Milosz; Gambassi, Andrea; Cugliandolo, Leticia; Konik, Robert; Foini, Laura

doi:10.21468/SciPostPhys.3.3.023

Title: Probing non-thermal density fluctuations in the one-dimensional Bose gas

Journal Article · Wed Sep 27 00:00:00 EDT 2017 · SciPost Physics

DOI:https://doi.org/10.21468/SciPostPhys.3.3.023· OSTI ID:1395184

De Nardis, Jacopo ^[1]; Panfil, Milosz ^[2];

^[3]; Cugliandolo, Leticia ^[4];

^[5]; Foini, Laura ^[6]

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

Quantum integrable models display a rich variety of non-thermal excited states with unusual properties. The most common way to probe them is by performing a quantum quench, i.e., by letting a many-body 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 fluctuation-dissipation theorem that we provide. Our procedure allows us to completely reconstruct the stationary state of a quantum integrable system from state-of-the-art experimental observations.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-98CH10886

OSTI ID:: 1395184

Journal Information:: SciPost Physics, Journal Name: SciPost Physics Vol. 3 Journal Issue: 3; ISSN 2542-4653

Publisher:: Stichting SciPostCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 11 works

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