Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: New Instruments and Methods

CPP 11.19: Poster

Montag, 14. März 2011, 17:30–19:30, P2

Universal Long-Time Behavior of Spin Echo — •Benno Meier¹, Jonas Kohlrautz¹, Boris Fine², and Jürgen Haase¹ — ¹University of Leipzig, Faculty of Physics and Earth Science, Linnéstrasse 5, 04103 Leipzig, Germany — ²University of Heidelberg, Institute for Theoretical Physics, Philosophenweg 19, 69120 Heidelberg, Germany

Nuclear magnetic resonance (NMR) is a versatile tool also for the investigation of many-body dynamics in quantum mechanics. Here we report on preliminary measurements of free induction and solid echo decays of ¹⁹F spins (I = 1/2) in an isolated cubic lattice (CaF₂). In agreement with a recently developed generic theoretical description we find that the long-time decay of both solid echo and free induction decay (FID) is described by an exponentially decaying oscillatory function where exponential decay rate and frequency of oscillations are the same for both the FID and the solid echo and do not depend on the initial state of the spin system at the end of the pulse sequence. This behaviour supports the notion of eigenvalues of time evolution operators in chaotic many-body quantum systems.