Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5423841 | Surface Science | 2009 | 5 Pages |
Abstract
The dispersion of sheet plasmons in two-dimensional electron gas (2DEG) systems prepared on Si(1Â 1Â 1)-(3Ã3)-Ag surface was investigated by angle-resolved high-resolution electron-energy-loss spectroscopy (HREELS) in an in-situ ultrahigh vacuum environment. The evolution of dispersion at the low coverage of additional silver adatoms shows a behavior associating with two-dimensional adatom gas phase and the critical coverage to sustain this phase is also determined. Dispersion at higher coverage of additional silver adatoms features a gap opening in the long wavelength limit (momentum qâ0), suggesting a new mode of plasmon. A calculation based on the theory of surface plasmons implies this plasmon is 3D-type surface plasmon and reveals a smooth transition from a 2D sheet plasmon to a 3D surface plasmon.
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Authors
Yu Liu, Roy F. Willis,