Anomalies in the NMR of Silicon: Unexpected Spin Echoes in a Dilute Dipolar Solid

Details Anomalies in the NMR of Silicon: Unexpected Spin Echoes in a Dilute Dipolar Solid Anomalies in the NMR of Silicon: Unexpected Spin Echoes in a Dilute Dipolar Solid

2003-08-27

arxiv.org/abs/cond-mat/0308584v1

Physics

Condensed Matter

4 pgs., 5 color eps figs, REVTEX 4.0, accepted to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.153302

NMR spin echo measurements of $^{29}$Si in Silicon powders have uncovered a variety of surprising phenomena that appear to be independent of doping. These surprises include long tails and even-odd asymmetry in Carr-Purcell-Meiboom-Gill (CPMG) echo trains, and anomalous stimulated echoes with several peculiar characteristics. Given the simplicity of this spin system, these results, which to date defy explanation, present a new and interesting puzzle in solid state NMR. In the broader context of quantum computation, these experiments suggest that similar surprises may be found in other systems with small, long-range, qubit-qubit interactions, particularly when ``bang-bang'' control is used.

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