20.500.12556/DiRROS-28920 Single-particle universality of the many-body spectral form factor We consider systems of fermions evolved by noninteracting unitary circuits with correlated on-site potentials. When these potentials are drawn from the eigenvalue distribution of a circular random matrix ensemble, the single-particle sector exhibits chaotic dynamics. The corresponding many-body spectral form factors (SFFs) can be computed exactly, revealing signatures of single-particle chaos in the many-body spectral statistics. Due to the absence of interactions the SFF grows exponentially in time, a result which we demonstrate through simple arguments, scaling collapses, and closed-form evaluation of the SFF. Upon introducing interactions, the SFF crosses over to a linear growth regime consistent with many-body random matrix universality. Our exact results for the SFF provide a baseline for future studies of the crossover between single-particle and many-body random matrix behavior. physics quantum chaos disordered systems kvantni kaos neurejeni sistemi true false true American Physical Society Angleški jezik Slovenski jezik Neznano 2026-04-14 10:14:05 2026-04-14 10:14:05 2026-04-15 03:57:35 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Opis vira z dne 8. 4. 2026; str. 160403-1-160403-6 [article no.] 160403 Vol. 134 Apr. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-11-08 2024-03-12 2025-04-23 53 1079-7114 10.1103/PhysRevLett.134.160403 274482691 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.160403 1 ea72215f-37d9-11f1-9cc3-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=43134 RAZ_Flynn_Michael_O._2025.pdf RAZ_Flynn_Michael_O._2025.pdf 1 2DAE22B8AABCCF6F77455872D1ABC863 9402be5bc9f1c03bb2cb29a01bcecae2b3ac04721e123eb894203d445342de8f 469e651f-37da-11f1-9cc3-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=43135 Institut Jožef Stefan 0 0 0