Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 63: Quantum gases: Lattices III
Q 63.2: Talk
Friday, March 21, 2014, 14:15–14:30, UDL HS2002
Microscopic observation of magnon bound states and their dynamics — •Sebastian Hild1, Takeshi Fukuhara1, Peter Schauß1, Johannes Zeiher1, Frauke Seeßelberg1, Immanuel Bloch1,2, and Christian Groß1 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Fakultät für Physik, Ludwig-Maximilians-Universität München, 80799 München, Germany
Ultra-cold atoms in optical lattices provide an ideal system for the study of spin Hamiltonians. The system parameters can be well controlled and site resolved detection of the atoms in the lattice offers a novel local probe for such systems. Here we report on the observation of free and bound magnon states in the ferromagnetic Heisenberg model. We study the dynamics of these states after a local spin flip excitation. The free magnon state is discriminated from the bound state by in-situ correlation measurements and their different effective mass results in a distinct propagation speed.
Furthermore we report on ongoing experiments studying the dynamics of spin waves initially imprinted into the system.