We have clearly evidenced the contribution of true surface states, in the range 1.8-2.5 eV, to the optical anisotropy of the GaAs(001)2x4 surface grown in situ by molecular beam epitaxy. These spectral features are well below the photon energy (2.9 eV) where bulklike anisotropies appear in coincidence with the E-1 bulk critical point. The surface character is established by studying the evolution of the reflectance anisotropy spectroscopy spectra versus oxygen exposure. The interpretation is strengthened by comparison with high-resolution electron-energy-loss spectra measured on the same surface and by first-principles density-functional theory calculations.

Surface states at the GaAs(001)2X4 surface / Arciprete, F.; Goletti, C.; Placidi, E.; Hogan, C.; Chiaradia, P.; Fanfoni, M.; Patella, F.; Balzarotti, A.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 69:8(2004), pp. 813081-813084.

Surface states at the GaAs(001)2X4 surface

Placidi E.;
2004

Abstract

We have clearly evidenced the contribution of true surface states, in the range 1.8-2.5 eV, to the optical anisotropy of the GaAs(001)2x4 surface grown in situ by molecular beam epitaxy. These spectral features are well below the photon energy (2.9 eV) where bulklike anisotropies appear in coincidence with the E-1 bulk critical point. The surface character is established by studying the evolution of the reflectance anisotropy spectroscopy spectra versus oxygen exposure. The interpretation is strengthened by comparison with high-resolution electron-energy-loss spectra measured on the same surface and by first-principles density-functional theory calculations.
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/1327377
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 19
  • ???jsp.display-item.citation.isi??? 17
social impact