Anomalously fast heating of ground states in dephased SU(N) spin systems
Abstract
We identify a strong quantum Mpemba effect in which a many-body ground state heats faster than every Gibbs state at finite positive temperature under the same dissipative dynamics within a fixed-color sector. In ferromagnetic SU(N) exchange systems with local dephasing, exact coherence shells confine the ground-state evolution and exclude all slower Liouvillian modes. Its relaxation rate is fixed by the bath, independently of system size, exchange graph, and integrability. We derive an energy-resolved sign criterion that guarantees a slower thermal contribution throughout the positive-temperature range. An exact finite-chain solution proves this rate inversion, and symmetry-resolved calculations confirm the criterion in larger spin-one chains, including nonintegrable exchange. The zero-temperature endpoint of a continuous Gibbs family can therefore be dynamically isolated by its exact exclusion from slow relaxation channels.
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BibTeX
@misc{lou2026anomalously,
title = {{Anomalously fast heating of ground states in dephased $SU(N)$ spin systems}},
author = {Tairan Lou and Junxiao Chen and Xiang-Ping Jiang and Mingdi Xu and Lei Pan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.25310},
eprint = {2610.25310},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.25310},
}
RIS
TY - UNPB
TI - Anomalously fast heating of ground states in dephased SU(N) spin systems
AU - Tairan Lou
AU - Junxiao Chen
AU - Xiang-Ping Jiang
AU - Mingdi Xu
AU - Lei Pan
PY - 2026
DA - 2026/10/18
PB - arXiv
DO - 10.48550/arxiv.2610.25310
UR - https://arxiv.org/abs/2610.25310
AB - We identify a strong quantum Mpemba effect in which a many-body ground state heats faster than every Gibbs state at finite positive temperature under the same dissipative dynamics within a fixed-color sector. In ferromagnetic SU(N) exchange systems with local dephasing, exact coherence shells confine the ground-state evolution and exclude all slower Liouvillian modes. Its relaxation rate is fixed by the bath, independently of system size, exchange graph, and integrability. We derive an energy-resolved sign criterion that guarantees a slower thermal contribution throughout the positive-temperature range. An exact finite-chain solution proves this rate inversion, and symmetry-resolved calculations confirm the criterion in larger spin-one chains, including nonintegrable exchange. The zero-temperature endpoint of a continuous Gibbs family can therefore be dynamically isolated by its exact exclusion from slow relaxation channels.
ER -