INVESTIGADORES
NESSI Emilio Nicolas
artículos
Título:
Prethermalization and glassiness in the bosonic Hubbard model
Autor/es:
IGNACIO SALAZAR LANDEA; EMILIO NICOLAS NESSI
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2015 vol. 91 p. 636011 - 636019
ISSN:
1050-2947
Resumen:
We investigate the nonequilibrium dynamics of the bosonic Hubbard model
starting from inhomogeneous superfluid or Mott insulator initial states
using the truncated Wigner approximation (TWA). We find that the
relaxation of the system develops in two steps for sufficiently large
interaction strengths: after a fast relaxation the system gets caught in
metastable prethermalized states that precede the true equilibrium
state. We find that the lifetime of these prethermalized states
increases by several orders of magnitude as we increase the on-site
interaction strength beyond a threshold value. We show that the
emergence of long-lived metastable states in the quantum dynamics is
associated with an ergodic (active) to nonergodic (inactive) dynamical
phase transition in the ensemble of classical trajectories that
contribute to the semiclassical limit. This dynamical phase transition,
which is very similar to that found in different classical models of
glasses, is closely related to the dynamic heterogeneity of the
classical relaxation.