Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: All-optical Coherent Control of Electrical Currents in Single GaAs
  Nanowires   A phase-stable superposition of femtosecond pulses and their second harmonic
induces ultrashort microampere current bursts in single unbiased GaAs
nanowires. Current injection relies on quantum interference of one- and
two-photon absorption pathways.

17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg