Suppression of nuclear polarization near the surface of optically pumped GaAs

M. R. Fitzsimmons; B. J. Kirby; N. W. Hengartner; F. Trouw; M. J. Erickson; S. D. Flexner; T. Kondo; C. Adelmann; C. J. Palmstrøm; P. A. Crowell; W. C. Chen; T. R. Gentile; J. A. Borchers; C. F. Majkrzak; R. Pynn

doi:10.1103/PhysRevB.76.245301

Suppression of nuclear polarization near the surface of optically pumped GaAs

M. R. Fitzsimmons, B. J. Kirby, N. W. Hengartner, F. Trouw, M. J. Erickson, S. D. Flexner, T. Kondo, C. Adelmann, C. J. Palmstrøm, P. A. Crowell, W. C. Chen, T. R. Gentile, J. A. Borchers, C. F. Majkrzak, R. Pynn

Physics and Astronomy (Twin Cities)

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Abstract

We measured the spin dependence of polarized neutrons reflected by a GaAs sample as it was optically pumped. This dependence was correlated with the helicity of the circularly polarized light and found to oscillate with neutron wave vector transfer. The data provide definitive evidence that optically induced nuclear polarization in GaAs is not uniform with depth. Quantitative analysis of the data shows that nuclear polarization is suppressed for tens of nanometers near the surface of GaAs.

Original language	English (US)
Article number	245301
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	76
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.76.245301
State	Published - Dec 3 2007

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Fitzsimmons, M. R., Kirby, B. J., Hengartner, N. W., Trouw, F., Erickson, M. J., Flexner, S. D., Kondo, T., Adelmann, C., Palmstrøm, C. J., Crowell, P. A., Chen, W. C., Gentile, T. R., Borchers, J. A., Majkrzak, C. F., & Pynn, R. (2007). Suppression of nuclear polarization near the surface of optically pumped GaAs. Physical Review B - Condensed Matter and Materials Physics, 76(24), Article 245301. https://doi.org/10.1103/PhysRevB.76.245301

Fitzsimmons, MR, Kirby, BJ, Hengartner, NW, Trouw, F, Erickson, MJ, Flexner, SD, Kondo, T, Adelmann, C, Palmstrøm, CJ, Crowell, PA, Chen, WC, Gentile, TR, Borchers, JA, Majkrzak, CF & Pynn, R 2007, 'Suppression of nuclear polarization near the surface of optically pumped GaAs', Physical Review B - Condensed Matter and Materials Physics, vol. 76, no. 24, 245301. https://doi.org/10.1103/PhysRevB.76.245301

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abstract = "We measured the spin dependence of polarized neutrons reflected by a GaAs sample as it was optically pumped. This dependence was correlated with the helicity of the circularly polarized light and found to oscillate with neutron wave vector transfer. The data provide definitive evidence that optically induced nuclear polarization in GaAs is not uniform with depth. Quantitative analysis of the data shows that nuclear polarization is suppressed for tens of nanometers near the surface of GaAs.",

author = "Fitzsimmons, {M. R.} and Kirby, {B. J.} and Hengartner, {N. W.} and F. Trouw and Erickson, {M. J.} and Flexner, {S. D.} and T. Kondo and C. Adelmann and Palmstr{\o}m, {C. J.} and Crowell, {P. A.} and Chen, {W. C.} and Gentile, {T. R.} and Borchers, {J. A.} and Majkrzak, {C. F.} and R. Pynn",

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doi = "10.1103/PhysRevB.76.245301",

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AU - Fitzsimmons, M. R.

AU - Kirby, B. J.

AU - Hengartner, N. W.

AU - Trouw, F.

AU - Erickson, M. J.

AU - Flexner, S. D.

AU - Kondo, T.

AU - Adelmann, C.

AU - Palmstrøm, C. J.

AU - Crowell, P. A.

AU - Chen, W. C.

AU - Gentile, T. R.

AU - Borchers, J. A.

AU - Majkrzak, C. F.

AU - Pynn, R.

PY - 2007/12/3

Y1 - 2007/12/3

N2 - We measured the spin dependence of polarized neutrons reflected by a GaAs sample as it was optically pumped. This dependence was correlated with the helicity of the circularly polarized light and found to oscillate with neutron wave vector transfer. The data provide definitive evidence that optically induced nuclear polarization in GaAs is not uniform with depth. Quantitative analysis of the data shows that nuclear polarization is suppressed for tens of nanometers near the surface of GaAs.

AB - We measured the spin dependence of polarized neutrons reflected by a GaAs sample as it was optically pumped. This dependence was correlated with the helicity of the circularly polarized light and found to oscillate with neutron wave vector transfer. The data provide definitive evidence that optically induced nuclear polarization in GaAs is not uniform with depth. Quantitative analysis of the data shows that nuclear polarization is suppressed for tens of nanometers near the surface of GaAs.

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Suppression of nuclear polarization near the surface of optically pumped GaAs

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