InP(001)-(2 x 1) surface: a hydrogen stabilized structure |
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Authors: | Schmidt W G Hahn P H Bechstedt F Esser N Vogt P Wange A Richter W |
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Affiliation: | Institut für Festk?rpertheorie und Theoretische Optik, Friedrich-Schiller-Universit?t, Max-Wien-Platz 1, 07743 Jena, Germany. W.G.Schmidt@ifto.physic.uni-jena.de |
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Abstract: | The InP(001)(2 x 1) surface has been reported to consist of a semiconducting monolayer of buckled phosphorus dimers. This apparent violation of the electron counting principle was explained by effects of strong electron correlation. Combining first-principles calculations with reflectance anisotropy spectroscopy and LEED experiments, we find that the (2 x 1) reconstruction is not at all a clean surface: it is induced by hydrogen adsorbed in an alternating sequence on the buckled P dimers. Thus, the microscopic structure of the InP growth plane relevant to standard gas phase epitaxy conditions is resolved and shown to obey the electron counting rule. |
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