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TT: Fachverband Tiefe Temperaturen
TT 37: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...
TT 37.1: Vortrag
Mittwoch, 16. März 2011, 14:00–14:15, HSZ 105
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
In recent experiments single-site resolved observation of cold atoms in optical lattices has been demonstrated. Thus it is possible to take a snapshot of a quantum many-body system, which opens a new way of observing its real-time dynamics. This inspired us to address the question how an interacting quantum-many body system evolves in time when the positions of the atoms are frequently observed. Using time-dependent DMRG we obtain the time evolution of the full many-body wave function, that is then periodically projected in order to simulate realizations of stroboscopic measurements. For the example of a 1-D chain of spin-polarized fermions with nearest-neighbor interaction, we find regimes for which many-particle configurations are stabilized and destabilized depending on the interaction strength and the time between observations. This model can be experimentally realized in optical latices with 2-species fermions in the insulating phase. We also discuss the possibility of observing just a single site and thus requiring only partial information about the many-body system. This leads to new effects that are not related to the usual quantum Zeno physics.