Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2

TT 37.11: Vortrag

Donnerstag, 29. März 2012, 12:15–12:30, H 3005

Relaxation of fermionic quantum systems after an interaction quench — •Simone A. Hamerla and Götz S. Uhrig — TU Dortmund, Theoretische Physik I, 44221 Dortmund, Germany

An impressive progress on experimental side has led to great interest in non-equilibrium dynamics. Thus we investigate the behavior of fermionic systems after a quench, i.e., a sudden change in the intrinsic parameters. We focus on interaction quenches and study the momentum distribution of 1D and 2D Hubbard models, where the interaction between particles is suddenly turned on.

In our approach we find surprising correspondence between results for the 1D model and the D=∞ DMFT results in the case of large interaction strengths.
The technique used is a semi-analytic approach based on the Heisenberg equations of motion [1]. We aim at a description of the behavior in the prethermalization regime, i.e., on short and intermediate time scales. Besides the momentum distribution the method allows for a discussion of other observables for various dopings.
G.S. Uhrig Phys. Rev. A 80, 061602(R)