In this thesis, the author has developed a high-resolution
spin-resolved photoemission spectrometer that achieves the
world-best energy resolution of 8 meV. The author has designed a
new, highly efficient mini Mott detector that has a large electron
acceptance angle and an atomically flat gold target to enhance the
efficiency of detecting scattered electrons.
The author measured the electron and spin structure of Bi thin
film grown on a Si(111) surface to study the Rashba effect. Unlike
the conventional Rashba splitting, an asymmetric in-plane spin
polarization and a tremendous out-of-plane spin component were
observed. Moreover, the author found that the spin polarization of
Rashba surface states is reduced by decreasing the film thickness,
which indicates the considerable interaction of Rashba spin-split
states between the surface and Bi/Si interface.
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