Strongly anisotropic roughness in surfaces driven by an oblique particle flux

Details Strongly anisotropic roughness in surfaces driven by an oblique particle flux Strongly anisotropic roughness in surfaces driven by an oblique particle flux

2006-04-13

arxiv.org/abs/cond-mat/0604363v1

Phys. Rev. E 73, 051603 (2006)

Physics

Condensed Matter

Statistical Mechanics

11 pages, 2 figures, REVTeX 4

Scientific paper

10.1103/PhysRevE.73.051603

Using field theoretic renormalization, an MBE-type growth process with an obliquely incident influx of atoms is examined. The projection of the beam on the substrate plane selects a "parallel" direction, with rotational invariance restricted to the transverse directions. Depending on the behavior of an effective anisotropic surface tension, a line of second order transitions is identified, as well as a line of potentially first order transitions, joined by a multicritical point. Near the second order transitions and the multicritical point, the surface roughness is strongly anisotropic. Four different roughness exponents are introduced and computed, describing the surface in different directions, in real or momentum space. The results presented challenge an earlier study of the multicritical point.

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