Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pulsed high harmonic generation of light due to pumped Bloch
  oscillations in noninteracting metals   We derive a simple theory for high-order harmonic generation due to pumping a
noninteracting metal with a large amplitude oscillating electric field. The
model assumes that the radiated light field arises from the acceleration of
electrons due to the time-varying current generated by the pump, and also
assumes that the system has a constant density of photoexcited carriers, hence
it ignores the dipole excitation between bands (which would create carriers in
semiconductors). We examine the circumstances under which odd harmonic
frequencies would be expected to dominate the spectrum of radiated light, and
we also apply the model to real materials like ZnO, for which high-order
harmonic generation has already been demonstrated in experiments.

10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg