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The electronic structure of ultrathin Bi (001) films on Si (111) -77 was studied by spin and angle-resolved photoemission spectroscopy. We directly observed a clear momentum-dependent spin splitting and polarization of the surface-state bands. The spin structure was antisymmetric with respect to the point as predicted by theory, and the obtained in-plane spin polarization was as high as 0. 5. The qualitative features of the observed spin polarization are discussed in comparison with the spin-polarized band structure obtained by first-principles calculations.
Hirahara et al. (2007) studied this question.