20.500.12556/RUL-155999 Eigenstate entanglement entropy in the integrable spin-$\frac{1}{2} XYZ$ model We study the average and the standard deviation of the entanglement entropy of highly excited eigenstates of the integrable interacting spin-$\frac{1}{2} XYZ$ chain away from and at special lines with $U(1)$ symmetry and supersymmetry. We universally find that the average eigenstate entanglement entropy exhibits a volume-law coefficient that is smaller than that of quantum-chaotic interacting models. At the supersymmetric point, we resolve the effect that degeneracies have on the computed averages. We further find that the normalized standard deviation of the eigenstate entanglement entropy decays polynomially with increasing system size, which we contrast with the exponential decay in quantum-chaotic interacting models. Our results provide state-of-the art numerical evidence that integrability in spin-$\frac{1}{2}$ chains reduces the average and increases the standard deviation of the entanglement entropy of highly excited energy eigenstates when compared with those in quantum-chaotic interacting models. statistical physics statistična fizika true false true Angleški jezik Slovenski jezik Članek v reviji 2024-04-26 10:49:38 2024-04-26 10:49:39 2024-04-27 04:02:51 0000-00-00 00:00:00 2024 0 0 Str. 024117-1-024117-9 iss. 2 Vol. 109 2024 0000-00-00 PostprintKoncna NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-02-20 536.9 2470-0045 10.1103/PhysRevE.109.024117 193905923 2311.10819v3.pdf 2311.10819v3.pdf 1 0514379A81AE181ED5EA8A3A4F5B2675 47c5b27d86d118fefc8c834b815748f7ebf92a143fc8f70632ac45d072789224 62ba4308-03ac-11ef-9119-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183197 https://journals.aps.org/pre/abstract/10.1103/PhysRevE.109.024117 0 69d19f2d-03ac-11ef-9119-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183198 Fakulteta za matematiko in fiziko 0 0 0