Journal
PHYSICAL REVIEW B
Volume 88, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.075403
Keywords
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Funding
- FP7/Future and Emerging Technologies (FET) 2D-NANOLATTICES of the European Commission [270749]
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Germanium deposited on single-crystal Ag(111) substrates at about 1/3-monolayer coverage forms a stable (root 3 x root 3)R30 degrees superstructure as seen by reflection high-energy electron diffraction. In situ angle resolved photoelectron spectroscopy reveals a rich band structure consisting of conelike features that cross the Fermi surface at the center ((Gamma) over bar points) of the superstructure surface Brillouin zone (SBZ), exhibiting a high dispersion with the surface parallel wave vector. With the help of first-principles calculations, it can be inferred that most of the features are explained in terms of an Ag2Ge-ordered surface alloy corresponding to surface states localized in the first two layers. One of the bands has a saddle point near the (M) over bar point of the SBZ with a characteristic split-band behavior distinguishing Ge surface alloy from other similar systems.
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