Multiple quantum coherence as detector of one-body one-dimensional dynamics in NMR experiments

E. RUFEIL FIORI; F. Y. OLIVA; H. M. PASTAWSKI; P. R. LEVSTEIN

Buenos Aires

Congreso; Encuentro de Óptica Aplicada; 2007

We test the one-body dynamics in a network of coupled spins using solid state nuclear magnetic resonance. In particular, one can generate an effective double quantum Hamiltonian (flip-flip + flop-flop) that mixes subspaces with different spin projection creating many-body superposition states: the multiple quantum coherences. These states can be probed through a bidimensional technique that allows one to follow the superposition weights as they are created. Multiple-quantum coherence intensities are measured under a double-quantum Hamiltonian in hydroxyapatite. Decoherence is tested through a form of Loschmidt echo experiment which reveals that in this quasi-1-d system, the double-quantum dynamics presents an exponential decay, in contrast with results in 3-d systems.