Intrinsic magnetism at silicon surfaces

Details Intrinsic magnetism at silicon surfaces Intrinsic magnetism at silicon surfaces

2010-08-31

arxiv.org/abs/1008.5358v1

Nat. Commun. 1:58 (2010)

Physics

Condensed Matter

Materials Science

6 pages, 3 figures

Scientific paper

10.1038/ncomms1056

It has been a long-standing goal to create magnetism in a nonmagnetic material by manipulating its structure at the nanometer scale. This idea may be realized in graphitic carbon: evidence suggests magnetic states at the edges of graphene ribbons and at grain boundaries in graphite. Such phenomena have long been regarded as unlikely in silicon because there is no graphitic bulk phase. Here we show theoretically that intrinsic magnetism indeed exists in a class of silicon surfaces whose step edges have a nanoscale graphitic structure. This magnetism is intimately connected to recent observations, including the coexistence of double- and triple-period distortions and the absence of edge states in photoemission. Magnetism in silicon may ultimately provide a path toward spin-based logic and storage at the atomic level.

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