Coherent scattering from silicon mocrystal surface

Details Coherent scattering from silicon mocrystal surface Coherent scattering from silicon mocrystal surface

2009-08-11

arxiv.org/abs/0908.1536v1

Physics

Condensed Matter

Materials Science

Submitted to Physical Review Letters

Scientific paper

Using coherent x-ray scattering, we evidenced atomic step roughness at the [111] vicinal surface of a silicon monocrystal of 0.05 degree miscut. Close to the (1/2 1/2 1/2) anti-Bragg position of the reciprocal space which is particularly sensitive to the [111] surface, the truncation rod exhibits a contrasted speckle pattern that merges into a single peak closer to the (111) Bragg peak of the bulk. The elongated shape of the speckles along the[111] direction confirms the monoatomic step sensibility of the technique. This experiment opens the way towards studies of step dynamics on crystalline surfaces.

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