Electrically detected spin echoes of donor nuclei in silicon
  The ability to probe the spin properties of solid state systems electrically underlies a wide variety of emerging technology. Here, we extend electrical readout of the nuclear spin states of phosphorus donors in silicon to the coherent regime with modified Hahn echo sequences. We find that, whilst the nuclear spins have electrically detected phase coherence times exceeding 2 ms, they are nonetheless limited by the artificially shortened lifetime of the probing donor electron. 
D. R. McCamey, C. Boehme, G. W. Morley and J. van Tol
cond-mat.other quant-ph