Photoemission studies of the Na/Ge(111)-3x1 surface

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The electronic structure of a Na/Ge(111)3 x 1 surface was investigated by valence-band and core-level photoemission spectroscopy with synchrotron radiation. The two-dimensional energy-band dispersion of the surface Brillouin zone along (M) over bar-<(Gamma)over bar>-(K) over bar was mapped out. The experimental surface-state dispersions show a better agreement with the theoretical results for the buckled Seiwatz model than the extended Pandey model. The surface core-level shift of the (3 x 1) surface is explained on the basis of the buckled Seiwatz model. The (3 x 1) surface reveals more covalent bonding character than other Na-adsorbed surfaces at room temperature, and its surface Fermi level is close to the valence-band maximum.
Publisher
IOP PUBLISHING LTD
Issue Date
1998-05
Language
English
Article Type
Article
Keywords

SCANNING-TUNNELING-MICROSCOPY; ANGLE-RESOLVED PHOTOEMISSION; CORE-LEVEL SHIFTS; BULK ELECTRONIC-STRUCTURE; SI(111) SURFACE; ALKALI-METALS; SEMICONDUCTOR SURFACES; K/SI(111) INTERFACES; ANNEALED GE(111); VALENCE-BAND

Citation

JOURNAL OF PHYSICS-CONDENSED MATTER, v.10, no.17, pp.3731 - 3741

ISSN
0953-8984
URI
http://hdl.handle.net/10203/11401
Appears in Collection
CH-Journal Papers(저널논문)
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