Surface reconstructions of epitaxial MnAs films grown on GaAs(111)B

A. Ouerghi, M. Marangolo, M. Eddrief, B. B. Lipinski, V. H. Etgens, M. Lazzeri, H. Cruguel, F. Sirotti, A. Coati, and Y. Garreau
Phys. Rev. B 74, 155412 – Published 11 October 2006

Abstract

This study makes reference to the surface structure of MnAs(0001) epilayers grown by molecular beam epitaxy through a multitechnical method that combines scanning tunneling microscopy (STM), x-ray photoelectron spectroscopy (XPS), grazing incidence x-ray diffraction (GIXD), and ab initio calculations. Two surface reconstructions were studied, i.e., the (2×2) and the (3×1). Photoemission measurements provided quantitative information about (i) the surface coverage of both surfaces and (ii) the atomic environment of surface atoms. An atomic structural model has been proposed for the observed reconstructions. On the basis of STM observations and ab initio calculations the (2×2) phase is constituted by As trimers adsorbed on an underlying Mn layer of bulk MnAs, while x-ray diffraction analysis, coupled with STM, showed that the (3×1) reconstructed surface is constituted of long and narrow As chains aligned with the ⟨110⟩ GaAs substrate equivalent directions.

    • Received 27 February 2006

    DOI:https://doi.org/10.1103/PhysRevB.74.155412

    ©2006 American Physical Society

    Authors & Affiliations

    A. Ouerghi1,*, M. Marangolo1, M. Eddrief1, B. B. Lipinski1,†, V. H. Etgens1, M. Lazzeri2, H. Cruguel3, F. Sirotti3,4, A. Coati3,4, and Y. Garreau3,4,5

    • 1Institut des NanoSciences de Paris, INSP, Université Pierre et Marie Curie–Paris 6, Université Denis Diderot–Paris 7, CNRS, UMR 7588 Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France
    • 2Institut de Minéralogie et de Physique des Milieux Condensés, IMPCM, Université Pierre et Marie Curie–Paris 6, CNRS, UMR 7590, case 115, 4 place Jussieu, F75252 Paris-Cedex 05, France
    • 3Laboratoire pour l’Utilisation du Rayonnement Electromagnétique (LURE), Centre Universitaire Paris Sud, BP 34, F-91898 Orsay, France
    • 4Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
    • 5Matériaux et Phénomènes Quantiques, MPQ, Université Denis Diderot–Paris 7, CNRS, UMR 7162 2 Place Jussieu, 75005 Paris, France

    • *Present address: Laboratoire de Photoniques et de Nanostructures, LPN-CNRS (UPR 20) Site Alcatel de Marcoussis Route de Nozay, 91460 Marcoussis, France.
    • Also at Programa de Pós-Graduação em Engenharia—UFPR, Centro Politécnico, Prédio da Administração 2° andar -Jardim das Américas, Cx.P.: 19011—CEP.: 81531-990. Curitiba—PR, Brazil.

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    Issue

    Vol. 74, Iss. 15 — 15 October 2006

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