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DY: Fachverband Dynamik und Statistische Physik
DY 23: Quantum Chaos I
DY 23.7: Vortrag
Donnerstag, 29. März 2012, 11:00–11:15, MA 001
Eigenmodes in the long-time behavior of a coupled spin system measured with NMR — •Benno Meier, Jonas Kohlrautz, and Jürgen Haase — University of Leipzig, Faculty of Physics and Earth Science, Linnéstrasse 5, 04103 Leipzig, Germany
The many body quantum dynamics of coupled spins I = 1/2 on an otherwise isolated cubic lattice are studied with nuclear magnetic resonance (NMR). By measuring the free induction decay (FID) of 19F spins in CaF2 across six orders of magnitude, unique insight into its long-time behavior is obtained. While the recently reported experimental evidence for universal long-time behavior of the form of an exponentially decaying cosine is confirmed experimentally for FID and solid echo experiments, it is possible for the first time to extract a second universal decay mode from the FIDs long-time behavior with comparable frequency but twice as fast a decay rate. The observed response is in agreement with recently published theoretical works and further supports the notion of eigenvalues in chaotic many-body quantum systems.