https://doi.org/10.1140/epjb/s10051-024-00715-2
Regular Article - Statistical and Nonlinear Physics
Entanglement detection in postquench nonequilibrium states: thermal Gibbs vs. generalized Gibbs ensemble
1
Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, 1525, Budapest, Hungary
2
Institute of Theoretical Physics, University of Szeged, 6720, Szeged, Hungary
Received:
29
February
2024
Accepted:
29
May
2024
Published online:
25
June
2024
We use entanglement witnesses related to the entanglement negativity of the state to detect entanglement in the XY chain in the postquench states in the thermodynamic limit after a quench when the parameters of the Hamiltonian are changed suddenly. The entanglement negativity is related to correlations, which in the postquench stationary state are described by a generalized Gibbs ensemble, in the ideal case. If, however, integrability breaking perturbations are present, the system is expected to thermalize. Here, we compare the nearest-neighbor entanglement in the two circumstances.
© The Author(s) 2024
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