Maurizio Fagotti (Avtor), Vanja Marić (Avtor), Lenart Zadnik (Avtor)

Povzetek

We consider nonequilibrium time evolution in quantum spin chains after a global quench. Usually a nonequilibrium quantum many-body system locally relaxes to a (generalized) Gibbs ensemble built from conserved operators with quasilocal densities. Here we exhibit explicit examples of local Hamiltonians that possess conservation laws with densities that are not quasilocal but act as such in the symmetry-restricted space where time evolution occurs. Because of them, the stationary state emerging at infinite time can exhibit exceptional features. We focus on a specific example with a spin-flip symmetry, which is the commonest global symmetry encountered in spin-1/2 chains. Among the exceptional properties, we find that, at late times, the excess of entropy of a spin block triggered by a local perturbation in the initial state grows logarithmically with the subsystem's length. We establish a connection with symmetry-protected topological order in equilibrium at zero temperature and study the melting of the order induced either by a (symmetry-breaking) rotation of the initial state or by an increase of the temperature.

Ključne besede

statistična fizika;neravnovesna statistična mehanika;statistical physics;nonequilibrium statistical mechanics;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FMF - Fakulteta za matematiko in fiziko
UDK: 536.9
COBISS: 188529667 Povezava se bo odprla v novem oknu
ISSN: 2469-9950
Št. ogledov: 9
Št. prenosov: 3
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: statistična fizika;neravnovesna statistična mehanika;
Vrsta dela (COBISS): Članek v reviji
Strani: str. 115117-1-115117-37
Letnik: ǂVol. ǂ109
Zvezek: ǂiss. ǂ11
Čas izdaje: 2024
DOI: 10.1103/PhysRevB.109.115117
ID: 23126082