Wednesday, July 3, 2013

1307.0390 (Maximilian Amsler et al.)

Conducting boron sheets formed by the reconstruction of the α-boron
(111) surface

Maximilian Amsler, Silvana Botti, Miguel A. L. Marques, Stefan Goedecker
Systematic ab initio structure prediction was applied for the first time to predict low energy surface reconstructions by employing the minima hopping method on the \alpha-boron (111) surface. Novel reconstruction geometries were identified and carefully characterized in terms of structural and electronic properties. Our calculations predict the formation of a planar, mono-layer sheet at the surface, which is responsible for conductive surface states. Furthermore, the isolated boron sheet is shown to be the ground state 2D-structure in vacuum at a hole density of \eta=1/5 and is therefore a potential candidate as a precursor for boron nano-structures.
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