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A small electron pocket composed of a metallic and parabolic surface-state band of Si(111)3x3-Ag was investigated in detail by high-resolution angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy (STS). The Fermi surface was a complete circle (Fermi ring), and the band dispersion was determined three dimensionally in energy-momentum space. The effective mass (m ...
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