While the As-rich 2 x 4 reconstruction of GaAs(001) is well explained by the so-called beta(2) structure, the atomic structure of the Ga-rich 4 x 2 phase has been discussed for a long time. In this review, the most important structural models for the GaAs(001) (4 x 2)/c(8 x 2) surface are compared from different theoretical and experimental points of view. The selected reconstructions include the recently proposed model, a new mixed dimer model, and the well-known beta, beta(2), Cerda and Skala zeta models. The different structures are compared on the basis of total energy calculations, simulations of STM experimental images and interpretation of X-ray diffraction data. Only the zeta model satisfies all criteria, and provides therefore a satisfactory explanation of the atomic structure of GaAs(001)-(4 x 2).
Paget, D., Pulci, O., Sauvage, M., Garreau, Y., Reining, L., Chiaradia, P., et al. (2002). Do we understand the structure of the gallium-rich surface of GaAs(001)? Experimental and theoretical approaches. SURFACE REVIEW AND LETTERS, 9(3-4), 1497-1510 [10.1142/S0218625X02003858].
Do we understand the structure of the gallium-rich surface of GaAs(001)? Experimental and theoretical approaches
PULCI, OLIVIA;CHIARADIA, PIETRO;
2002-01-01
Abstract
While the As-rich 2 x 4 reconstruction of GaAs(001) is well explained by the so-called beta(2) structure, the atomic structure of the Ga-rich 4 x 2 phase has been discussed for a long time. In this review, the most important structural models for the GaAs(001) (4 x 2)/c(8 x 2) surface are compared from different theoretical and experimental points of view. The selected reconstructions include the recently proposed model, a new mixed dimer model, and the well-known beta, beta(2), Cerda and Skala zeta models. The different structures are compared on the basis of total energy calculations, simulations of STM experimental images and interpretation of X-ray diffraction data. Only the zeta model satisfies all criteria, and provides therefore a satisfactory explanation of the atomic structure of GaAs(001)-(4 x 2).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.