Metallic and semi-metallic <100> silicon nanowires

Details Metallic and semi-metallic <100> silicon nanowires Metallic and semi-metallic <100> silicon nanowires

2004-12-09

arxiv.org/abs/cond-mat/0412218v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 4 figures; Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.94.026805

Silicon nanowires grown along the <100>-direction with a bulk Si core are studied with density functional calculations. Two surface reconstructions prevail after exploration of a large fraction of the phase space of nanowire reconstructions. Despite their energetical equivalence, one of the reconstructions is found to be strongly metallic while the other one is semi-metallic. This electronic-structure behavior is dictated by the particular surface states of each reconstruction. These results imply that doping is not required in order to obtain good conducting Si nanowires.

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