Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct evidence of enhanced Ga interdiffusion in InAs vertically aligned
  free-standing nanowires   We present direct evidence of enhanced Ga interdiffusion in InAs
free-standing nanowires grown at moderate temperatures by molecular beam
epitaxy on GaAs (111)B. Scanning electron microscopy together with X-ray
diffraction measurements in coplanar and grazing incidence geometries show that
nominally grown InAs NWs are actually made of In$_{0.86}$Ga$_{0.14}$As. Unlike
typical vapor-liquid-solid growth, these nanowires are formed by
diffusion-induced growth combined with strong interdiffusion from substrate
material. Based on the experimental results, a simple nanowire growth model
accounting for the Ga interdiffusion is also presented. This growth model could
be generally applicable to the molecular beam heteroepitaxy of III-V nanowires.

29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas