Freezing and shielding under global quenches for long-range interacting many-body systems
Abstract
We investigate how local perturbations spread on long-range interacting spin chains and show how their nonequilibrium behavior exactly matches the one of a Fermi-Hubbard model with long-range hoppings. We then focus on the thermalization of the fermionic model following a sudden quench of local interactions between two distinct fermionic species. For both models, the quasiparticle spectrum consists of gapped low-energy levels, while the high-energy ones accumulate at a single point. When the low-energy gaps are large enough, turning on the local interactions does not effectively mix high- and low-energy modes, resulting in a freezing of the dynamical evolution. In general, the states within the excited subspace are shielded from the long-range signatures of the model, which are responsible for the low-energy extended states, and the dynamics effectively look as if long-range couplings were absent. This shielding mechanism becomes evident in the presence of disorder. It is shown that shielding and freezing are a universal feature of long-range interacting systems, and their relation to the existence of quasistationary states is conjectured.
Related
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- Recent progress on thermal transport in one-dimensional long-range interacting Fermi-Pasta-Ulam-Tsingou lattice systems
- GEM: An implementation of the ghost-Gutzwiller approximation for simulating interacting quantum systems
BibTeX
@article{arrufatvicente2026freezing,
title = {{Freezing and shielding under global quenches for long-range interacting many-body systems}},
author = {Daniel Arrufat-Vicente and Nicolò Defenu},
journal = {Physical Review Research},
year = {2026},
month = oct,
doi = {10.1103/f7cn-h597},
url = {http://link.aps.org/doi/10.1103/f7cn-h597},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Freezing and shielding under global quenches for long-range interacting many-body systems
AU - Daniel Arrufat-Vicente
AU - Nicolò Defenu
PY - 2026
DA - 2026/10/23
JO - Physical Review Research
DO - 10.1103/f7cn-h597
UR - http://link.aps.org/doi/10.1103/f7cn-h597
AB - We investigate how local perturbations spread on long-range interacting spin chains and show how their nonequilibrium behavior exactly matches the one of a Fermi-Hubbard model with long-range hoppings. We then focus on the thermalization of the fermionic model following a sudden quench of local interactions between two distinct fermionic species. For both models, the quasiparticle spectrum consists of gapped low-energy levels, while the high-energy ones accumulate at a single point. When the low-energy gaps are large enough, turning on the local interactions does not effectively mix high- and low-energy modes, resulting in a freezing of the dynamical evolution. In general, the states within the excited subspace are shielded from the long-range signatures of the model, which are responsible for the low-energy extended states, and the dynamics effectively look as if long-range couplings were absent. This shielding mechanism becomes evident in the presence of disorder. It is shown that shielding and freezing are a universal feature of long-range interacting systems, and their relation to the existence of quasistationary states is conjectured.
SN - 2643-1564
ER -