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Enhanced electron spin polarization in photoemission from thin GaAs
1.See for example, J. Kessler, Polarized Electrons, 2nd ed. (Springer, Berlin, 1985).
2.C. Y. Prescott et al., Phys. Lett. B 77, 347 (1978);
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5.For the details of antimony capping, see T. M. Kerr, D. C. Peacock, and C. E. C. Wood, J. Appl. Phys. 63, 1494 (1988).
6.C. K. Sinclair, E. L. Garwin, R. H. Miller, and C. Y. Prescott, in Proceedings of the Argonne Symposium on High Energy Physics with Polarized Beams and Targets, edited by M. L. Marshak (American Institute of Physics, New York, 1976), p. 424.
7.The following dyes were used: HITC(840 nm), DOTC(775 nm), oxazine 750 (750 nm), LD700 (720 nm), oxazine 720 (670 nm), rhodamine 640 (625 nm), and rhodamine 590 (575 nm). The numbers in parentheses indicate the wavelength at the maximum lasing intensity.
8.C. K. Sinclair, in Proceedings of the Symposium on Advanced Accelerator Concepts, AIP Conference Proceedings 156, edited by F. E. Mills (American Institute of Physics, New York, 1987), p. 298.
9.The lifetime is defined to be the time required for the photocurrent to decrease by a factor of e although the photocurrent does not always decrease exponentially.
10.The band gap increases at lower temperature and therefore the polarization versus wavelength curve shown in Fig. 2 would shift towards a shorter wavelength. However, a cold cathode would condense residual gases and the quantum yield would decrease more rapidly with time than for a cathode at room temperature.
11.For example, H. J. Drouhin, C. Hermann, and G. Lampel, Phys. Rev. B 31, 3859 and (1985).
12.D. T. Pierce, F. Meier, and P. Zurcher, Phys. Lett. 51A, 465 (1975);
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13.T. Maruyama and C. Y. Prescott, Stanford Linear Accelerator Center Internal Note, SLCPOL No. 25, March 1989 (unpublished).
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