Atomic-resolution imaging of clean and hydrogen-terminated C(100)-(2x1) diamond surfaces using noncontact AFM
Autor(en): | Nimmrich, M. Kittelmann, M. Rahe, P. Mayne, A. J. Dujardin, G. von Schmidsfeld, A. Reichling, M. Harneit, W. Kuehnle, A. |
Stichwörter: | AB-INITIO; CONDUCTIVITY; DEFECTS; DESORPTION; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; Physics, Condensed Matter; SCANNING-TUNNELING-MICROSCOPY; STEPS; STM | Erscheinungsdatum: | 2010 | Herausgeber: | AMER PHYSICAL SOC | Journal: | PHYSICAL REVIEW B | Volumen: | 81 | Ausgabe: | 20 | Zusammenfassung: | High-purity, type IIa diamond is investigated by noncontact atomic force microscopy (NC-AFM). We present atomic-resolution images of both the electrically conducting hydrogen-terminated C(100)-(2 x 1) : H surface and the insulating C(100)-(2 x 1) surface. For the hydrogen-terminated surface, a nearly square unit cell is imaged. In contrast to previous scanning tunneling microscopy experiments, NC-AFM imaging allows both hydrogen atoms within the unit cell to be resolved individually, indicating a symmetric dimer alignment. Upon removing the surface hydrogen, the diamond sample becomes insulating. We present atomic-resolution images, revealing individual C-C dimers. Our results provide real-space experimental evidence for a (2 x 1) dimer reconstruction of the truly insulating C(100) surface. |
ISSN: | 10980121 | DOI: | 10.1103/PhysRevB.81.201403 |
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