Time fluctuations in isolated quantum systems of interacting particles

AXEL D. DENTE; PABLO ZANGARA; E. J. TORRES-HERRERA; H. M. PASTAWSKI; ANÍBAL IUCCI ; LEA F. SANTOS

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

American Physical Society

Lugar: new york; Año: 2013 vol. 88 p. 32913 - 32924

1063-651X

PHYSICAL REVIEW E 88, 032913 (2013)Time fluctuations in isolated quantum systems of interacting particlesP.R. Zangara, A.D. Dente, E. J. Torres-Herrera, H.M. Pastawski,A.I., and L.F. SantosNumerically, we study the time fluctuations of few-body observables after relaxation in isolated dynamical quantum systems of interacting particles. Our results suggest that they decay exponentially with system size in both regimes, integrable and chaotic. The integrable systems considered are solvable with the Bethe ansatz and have a highly nondegenerate spectrum. This is in contrast with integrable Hamiltonians mappable to noninteractingones. We show that the coefficient of the exponential decay depends on the level of delocalization of the initial state with respect to the energy shell.