Universal dynamics from a single-particle dark state
Abstract
Open quantum systems can host dark or subradiant states whose decay is highly suppressed. While these states have been extensively studied in the few-excitation regime, their impact on the many-body dynamics remains largely unexplored. Here, we study a spin chain subject to correlated dissipation on neighboring sites, which admits a single-particle dark state at zero momentum. We show that the single-particle dark state qualitatively alters the many-body dynamics at long times, and identify its distinct universal behavior. While the zero-momentum mode is dark at the single-particle level, it decays slowly as 1/log t as it becomes dressed by other modes through a dissipation-induced nonlinearity. We demonstrate that the momentum distribution takes a universal scaling form in k√t, and the total density decays as 1/√tlog t. Our results further elucidate the origin of the conflicting results in recent works. Finally, we corroborate the analytics with matrix product state simulations and show that the same universal behavior persists for soft-core interactions, underscoring the universality of the emergent dynamics.
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BibTeX
@misc{daraban2026universal,
title = {{Universal dynamics from a single-particle dark state}},
author = {Ruben Daraban and Arghavan Safavi-Naini and Johannes Schachenmayer and Mohammad Maghrebi},
howpublished = {HAL},
year = {2026},
month = may,
eprint = {2605.16494},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05786063v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Universal dynamics from a single-particle dark state
AU - Ruben Daraban
AU - Arghavan Safavi-Naini
AU - Johannes Schachenmayer
AU - Mohammad Maghrebi
PY - 2026
DA - 2026/05/15
PB - HAL
UR - https://hal.science/hal-05786063v1
AB - Open quantum systems can host dark or subradiant states whose decay is highly suppressed. While these states have been extensively studied in the few-excitation regime, their impact on the many-body dynamics remains largely unexplored. Here, we study a spin chain subject to correlated dissipation on neighboring sites, which admits a single-particle dark state at zero momentum. We show that the single-particle dark state qualitatively alters the many-body dynamics at long times, and identify its distinct universal behavior. While the zero-momentum mode is dark at the single-particle level, it decays slowly as 1/log t as it becomes dressed by other modes through a dissipation-induced nonlinearity. We demonstrate that the momentum distribution takes a universal scaling form in k√t, and the total density decays as 1/√tlog t. Our results further elucidate the origin of the conflicting results in recent works. Finally, we corroborate the analytics with matrix product state simulations and show that the same universal behavior persists for soft-core interactions, underscoring the universality of the emergent dynamics.
ER -