Layers of MnAs were grown onto GaAs(111)B substrates by molecular beam epitaxy and their morphology was studied in situ by scanning tunneling microscopy. The surface was atomically flat with bilayer-steps and a (2x2) reconstruction on the terraces. Screw dislocations with associated growth spirals were observed. Positive and negative Burgers vectors were found with equal probability. Steps with alternating smooth and jagged edges were also observed. This morphology was explained by the anisotropic growth speed of bilayer-steps.

Surface Reconstruction, Screw Dislocations and Anisotropic Step Flow Growth of MnAs on GaAs(111)B Substrates. M.Kästner, L.Däweritz, K.H.Ploog: Surface Science, 2002, 511[1-3], 323-30