Regensburg 2007 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 7: Statistical physics far from thermal equilibrium

DY 7.5: Talk

Monday, March 26, 2007, 15:30–15:45, H5

Strongly Correlated Fermions after a Quantum Quench — •Salvatore Manmana^1,2,3, Stefan Wessel¹, Reinhard Noack², and Alejandro Muramatsu¹ — ¹Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart — ²AG Vielteilchennumerik, Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg — ³Institute of Theoretical Physics, EPFL, CH-1015 Lausanne (Switzerland)

Using the adaptive time-dependent density-matrix renormalization group method (adaptive t-DMRG), 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 quasi-stationary state is non-thermal. This result holds for both integrable and non-integrable variants of the system.