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

P. Gumann, O. Patange, C. Ramanathan, H. Haas, O. Moussa, M. L.W. Thewalt, H. Riemann, N. V. Abrosimov, P. Becker, H. J. Pohl, K. M. Itoh, D. G. Cory

研究成果: Article査読

15 被引用数 (Scopus)

抄録

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 1.5×1015 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 cm3 sample (≈1015 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 P31-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 P31 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.

本文言語English
論文番号267604
ジャーナルPhysical review letters
113
26
DOI
出版ステータスPublished - 2014 12月 30

ASJC Scopus subject areas

  • 物理学および天文学一般

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