Strongly correlated fermions after a quantum quench

Phys Rev Lett. 2007 May 25;98(21):210405. doi: 10.1103/PhysRevLett.98.210405. Epub 2007 May 25.


Using the adaptive time-dependent density-matrix renormalization group method, we study the time evolution of strongly correlated spinless fermions on a one-dimensional lattice after a sudden change of the interaction strength. For certain parameter values, two different initial states (e.g., metallic and insulating) lead to observables which become indistinguishable after relaxation. We find that the resulting quasistationary state is nonthermal. This result holds for both integrable and nonintegrable variants of the system.