Optical anisotropy induced by cesium adsorption on the As-rich c(2x8) reconstruction of GaAs(001)
Articolo
Data di Pubblicazione:
2004
Citazione:
Optical anisotropy induced by cesium adsorption on the As-rich c(2x8) reconstruction of GaAs(001) / C. Hogan, D. Paget, O.E. Tereschenko, L. Reining, G. Onida. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 69:12(2004), pp. 125332.1-125332.7.
Abstract:
Upon adsorption of Cs, the As-rich c(2×8)/(2×4) reconstruction of GaAs(001) is found to exhibit an intense negative signal between 3 eV and 5 eV in the reflectance anisotropy spectrum. This signal has a universal character in that similar features also appear on the Ga-rich surface. The mechanism of this signal is interpreted using ab initio calculations of Cs adsorption at As and Ga sites of the As-rich surface. The calculations succeed in explaining the universality of the signal. In the vicinity of the E′0 bulk critical point at 4.5 eV, the signal arises from perturbation of bulk states terminating at the surface. At lower energies, the signal arises from the creation of new surface resonances induced by the Cs adatom.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
C. Hogan, D. Paget, O.E. Tereschenko, L. Reining, G. Onida
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