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