Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 1
TT 30.2: Vortrag
Mittwoch, 28. März 2012, 15:30–15:45, H 3005
Stroboscopic observation of quantum many-body dynamics — •Stefan Keßler1, Andreas Holzner2, Ian McCulloch3, Jan von Delft2, and Florian Marquardt1,4 — 1Institute for Theoretical Physics, Friedrich-Alexander-Universiät Erlangen-Nürnberg, Erlangen, Germany — 2Physics Department, ASC, CeNS, Ludwig- Maximilians-Universität München, München, Germany — 3School of Physical Sciences, University of Queensland, Brisbane, Australia — 4Max Planck Institute for the Science of Light, Erlangen, Germany
Recent experiments have demonstrated single-site resolved observation of cold atoms in optical lattices. Thus, in the future it may be possible to take repeated snapshots of an interacting quantum many-body system during the course of its evolution. Here we address the impact of the resulting quantum (anti-)Zeno physics on the many-body dynamics. We use time-dependent DMRG to obtain the time evolution of the full wave function, that is then periodically projected in order to simulate realizations of stroboscopic measurements. For the example of a 1-D lattice of spinless fermions with nearest-neighbor interactions, we find regimes for which many-particle configurations are stabilized or destabilized, depending on the interaction strength and the time between observations. We show that similar effects are expected for other models, such as the 1-D Fermi- and Bose-Hubbard model.