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arXiv · 2511.02618

Post-quench relaxation dynamics of Gross-Neveu lattice fermions

Domenico Giuliano·Reinhold Egger·Bidyut Dey·Andrea Nava
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Abstract

We study the quantum relaxation dynamics for a lattice version of the one-dimensional (1D) $N$-flavor Gross-Neveu (GN) model after a Hamiltonian parameter quench. Allowing for a system-reservoir coupling $\gamma$, we numerically describe the system dynamics through a time-dependent self-consistent Lindblad master equation. For a closed ($\gamma=0$) finite-size system subjected to an interaction parameter quench, the order parameter dynamics exhibits oscillations and revivals. In the thermodynamic limit, our results imply that the order parameter reaches its post-quench stationary value in accordance with the eigenstate thermalization hypothesis (ETH). However, time-dependent finite-momentum correlation matrix elements equilibrate only if $\gamma>0$. Our findings are consistent with the system being described by a pertinent Generalized Gibbs Ensemble (GGE) and, accordingly, highlight subtle yet important aspects of the post-quench relaxation dynamics of quantum many-body systems.

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cond-mat.stat-mechcond-mat.quant-gasquant-ph

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Domenico Giuliano, Reinhold Egger, Bidyut Dey, Andrea Nava. 2025-11-04. Post-quench relaxation dynamics of Gross-Neveu lattice fermions. https://doi.org/10.1103/qh7t-jsjm

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