20.500.12556/RUL-105237 Entanglement and diagonal entropies after a quench with no pair structure A typical working condition in the study of quantum quenches is that the initial state produces a distribution of quasiparticle excitations with an opposite-momentum-pair structure. In this work we investigate the dynamical and stationary properties of the entanglement entropy after a quench from initial states which do not have such structure: instead of pairs of excitations they generate $\nu$-plets of correlated excitations with $\nu$ > 2. Our study is carried out focusing on a system of non-interacting fermions on the lattice. We study the time evolution of the entanglement entropy showing that the standard semiclassical formula is not applicable. We propose a suitable generalisation which correctly describes the entanglement entropy evolution and perfectly matches numerical data. We finally consider the relation between the thermodynamic entropy of the stationary state and the diagonal entropy, showing that when there is no pair structure their ratio depends on the details of the initial state and lies generically between 1/2 and 1. quantum statistical mechanics integrable systems quantum entanglement kvantna statistična mehanika integrabilni sistemi kvantna prepletenost true false false Angleški jezik Slovenski jezik Neznano 2018-11-13 13:17:09 2018-11-13 13:17:09 2022-08-18 03:43:11 0000-00-00 00:00:00 2018 0 0 31 str. art. no. 063104 Vol. 2018 June 2018 0000-00-00 PostprintKoncna NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2019-06-18 536.93 1742-5468 10.1088/1742-5468/aac73f 3264868 21517607 RAZ_Bertini_Bruno_i2018.pdf RAZ_Bertini_Bruno_i2018.pdf 1 6C7C3B49BE17ADC87425C59F537D1D6A 7499f6db91a5ad713f5479ac407a19a2a7b1d20ae2126d0437b5ee9c0060a12f 25eefcfd-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=115850 https://iopscience.iop.org/article/10.1088/1742-5468/aac73f 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=140696 Fakulteta za matematiko in fiziko 0 0 0