Singular response to a dopant of an evaporating crystal surface

Details Singular response to a dopant of an evaporating crystal surface Singular response to a dopant of an evaporating crystal surface

2012-04-26

arxiv.org/abs/1204.5957v1

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

Moving crystal surfaces can undergo step-bunching instabilities, when subject to an electric current. We show analytically that an infinitesimal quantity of a dopant may invert the stability, whatever the sign of the current. Our study is relevant for experimental results [S.S. Kosolobov et al., JETP Lett. 81, 117 (2005)] on an evaporating Si(111) surface in the presence of a variable quantity of Au, whose density distribution is related to inhomogeneous Si diffusion.

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