Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Morphological regions and oblique incidence dot formation in a model of
  surface sputtering   We study solid surface morphology created by off-normal ion-beam sputtering
with an atomistic, solid-on-solid model of sputter erosion. With respect to an
earlier version of the model, we extend this model with the inclusion of
lateral erosion. Using the 2-dimensional structure factor, we found an upper
bound $\mu\simeq 2$, in the lateral straggle $\mu$, for clear ripple formation.
Above this upper bound, for longitudinal straggle $\sigma\gtrsim 1.7$, we found
the possibility of dot formation (without sample rotation). Moreover, a
temporal crossover from a hole topography to ripple topography with the same
value of collision cascade parameters was found. Finally, a scaling analysis of
the roughness, using the consecutive gradient approach, yields the growth
exponents $\beta=0.33$ and 0.67 for two different topographic regimes.

10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga