A detailed high-resolution electron-energy-loss-spectroscopy study of the surface collective and vibrational excitations of the clean n-doped GaAs(110) cleaved surface is presented. Measurements were taken exploiting a wide range of primary-beam energy and at two different dopant concentrations. Due to their coupling in the sample with higher doping, both the free-carrier plasmon and the Fuchs-Kliewer mode show dispersion. The phonon intensity behavior, when the primary-beam energy is changed, is opposite to that of the plasmon. The intensity behavior of the latter mode, in particular, suggests its spatial confinement beneath the surface. © 1989 The American Physical Society.
COLLECTIVE AND VIBRATIONAL EXCITATIONS ON THE N-DOPED GAAS(110) SURFACE / Betti, Maria Grazia; U., Del Pennino; Mariani, Carlo. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 39:9(1989), pp. 5887-5891. [10.1103/physrevb.39.5887]
COLLECTIVE AND VIBRATIONAL EXCITATIONS ON THE N-DOPED GAAS(110) SURFACE
BETTI, Maria Grazia;MARIANI, CARLO
1989
Abstract
A detailed high-resolution electron-energy-loss-spectroscopy study of the surface collective and vibrational excitations of the clean n-doped GaAs(110) cleaved surface is presented. Measurements were taken exploiting a wide range of primary-beam energy and at two different dopant concentrations. Due to their coupling in the sample with higher doping, both the free-carrier plasmon and the Fuchs-Kliewer mode show dispersion. The phonon intensity behavior, when the primary-beam energy is changed, is opposite to that of the plasmon. The intensity behavior of the latter mode, in particular, suggests its spatial confinement beneath the surface. © 1989 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
