Abstract
A scheme is proposed wherein nuclear magnetic resonance (NMR) can be induced and monitored using only optical fields. In analogy to radio-frequency fields used in traditional NMR, circularly polarized light creates electron spins in semiconductors whose hyperfine coupling could tip nuclear moments. Time-resolved Faraday rotation experiments were performed in which the frequency of electron Larmor precession was used as a magnetometer of local magnetic fields experienced by electrons in n-type gallium arsenide. Electron spin excitation by a periodic optical pulse train appears not only to prepare a hyperpolarized nuclear moment but also to destroy it resonantly at magnetic fields proportional to the pulse frequency. This resonant behavior is in many ways supportive of a simple model of optically induced NMR, but a curious discrepancy between one of the observed frequencies and classic NMR values suggests that this phenomenon is more complex.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 27, 2002, 5:40 a.m.) |
Deposited | 1 year, 7 months ago (Jan. 13, 2024, 4:18 a.m.) |
Indexed | 4 weeks ago (Aug. 2, 2025, 12:47 a.m.) |
Issued | 25 years, 7 months ago (Jan. 21, 2000) |
Published | 25 years, 7 months ago (Jan. 21, 2000) |
Published Print | 25 years, 7 months ago (Jan. 21, 2000) |
@article{Kikkawa_2000, title={All-Optical Magnetic Resonance in Semiconductors}, volume={287}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.287.5452.473}, DOI={10.1126/science.287.5452.473}, number={5452}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Kikkawa, J. M. and Awschalom, D. D.}, year={2000}, month=jan, pages={473–476} }