Intrinsic origin of spin echoes in dipolar solids generated by strong pulses

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Dale Li, Yanqun Dong, R. G. Ramos, J. D. Murray, K. MacLean, A. E. Dementyev, and S. E. Barrett
Department of Physics, Yale University, New Haven, Connecticut 06511, USA

Received 26 April 2007; revised 9 March 2008; published 24 June 2008

Inspectroscopy, it is conventional to treat pulses much stronger thanthe linewidth as delta functions. In NMR, this assumption leadsto the prediction that pulses do not refocus thedipolar coupling. However, NMR spin echo measurements in dipolar solidsdefy these conventional expectations when more than one pulseis used. Observed effects include a long tail in theCPMG echo train for short delays between pulses, aneven-odd asymmetry in the echo amplitudes for long delays, anunusual fingerprint pattern for intermediate delays, and a strong sensitivityto -pulse phase. Experiments that set limits on possible extrinsiccauses for the phenomena are reported. We find that theaction of the system's internal Hamiltonian during any real pulseis sufficient to cause the effects. Exact numerical calculations, combinedwith average Hamiltonian theory, identify terms that are sensitive toparameters such as pulse phase, dipolar coupling, and system size.Visualization of the entire density matrix shows a unique flowof quantum coherence from nonobservable to observable channels when applyingrepeated pulses.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.77.214306
DOI:	10.1103/PhysRevB.77.214306
PACS:	03.65.Yz; 03.67.Lx; 76.20.+q; 76.60.Lz 03.65.Yz Decoherence; open systems; quantum statistical methods 03.67.Lx Quantum computation architectures and implementations 76.20.+q General theory of magnetic resonances and relaxations 76.60.Lz Spin echoes (condensed matter NMR) YEAR: 2008
KEYWORDS:	spectral line breadth, spin echo (NMR)

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