Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 37.14: Talk

Wednesday, March 16, 2011, 17:45–18:00, HSZ 105

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

The impressive progress on experimental side in the context of fermionic atoms in optical lattices and especially the tunability of the interaction strength has led to new interest in the dynamics of quantum systems out of equilibrium.

We study the time evolution of fermionic systems after a quench, i.e. a sudden change in the intrinsic parameters of the system. In this context interaction quenches, where the interaction between particles is suddenly turned on, are of special interest.

In this setup we do not focus on the long time behavior of the system, which determines the thermalization but on short times after the quench, the so called prethermalization. The relaxation of the system is studied by the use of a semi-analytic approach based on the Heisenberg equations of motion [1]. This higher order equation of motion approach enables us to study the momentum distribution and other quantities of the system after the quench.
G.S. Uhrig Phys. Rev. A 80, 061602(R)