• DOI:10.1103/PhysRevLett.113.267604
• Corpus ID: 34859053

Inductive measurement of optically hyperpolarized phosphorous donor nuclei in an isotopically enriched silicon-28 crystal.

@article{Gumann2014InductiveMO,
  title={Inductive measurement of optically hyperpolarized phosphorous donor nuclei in an isotopically enriched silicon-28 crystal.},
  author={Patryk Gumann and Om Patange and Chandrasekhar Ramanathan and Holger Haas and Osama Moussa and Mike L. W. Thewalt and Helge Riemann and N. V. Abrosimov and Peter Becker and Hans-Joachim Pohl and Kohei M. Itoh and David G. Cory},
  journal={Physical review letters},
  year={2014},
  volume={113 26},
  pages={
          267604
        }
}

• P. Gumann, O. Patange, +9 authors D. Cory
• Published 21 July 2014
• Physics
• Physical review letters

We experimentally demonstrate the first inductive readout of optically hyperpolarized phosphorus-31 donor nuclear spins in an isotopically enriched silicon-28 crystal. The concentration of phosphorus donors in the crystal was 1.5×10(15)  cm(-3), 3 orders of magnitude lower than has previously been detected via direct inductive detection. The signal-to-noise ratio measured in a single free induction decay from a 1  cm(3) sample (≈10(15) spins) was 113. By transferring the sample to an X-band ESR spectrometer, we were able to obtain a lower bound for the nuclear spin polarization at 1.7 K of ∼64%. The (31)P-T2 measured with a Hahn echo sequence was 420 ms at 1.7 K, which was extended to 1.2 s with a Carr Purcell cycle. The T1 of the (31)P nuclear spins at 1.7 K is extremely long and could not be determined, as no decay was observed even on a time scale of 4.5 h. Optical excitation was performed with a 1047 nm laser, which provided above-band-gap excitation of the silicon. The buildup of the hyperpolarization at 4.2 K followed a single exponential with a characteristic time of 577 s, while the buildup at 1.7 K showed biexponential behavior with characteristic time constants of 578 and 5670 s.