Asymptotic non-Markovianity
  We investigate the asymptotic dynamics of exact quantum Brownian motion. We find that non-Markovianity can persist in the long-time limit, and that in general the asymptotic behaviour depends strongly on the system-environment coupling and the spectral density of the bath. 
Giuseppe Petrillo, Gianpaolo Torre, Fabrizio Illuminati
quant-ph cond-mat.other math-ph math.MP