Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conservation of torus-knot angular momentum in high-order harmonic
  generation   High-order harmonic generation stands as a unique nonlinear optical
up-conversion process, mediated by a laser-driven electron recollision
mechanism, which has been shown to conserve energy, momentum, and spin and
orbital angular momentum. Here we present theoretical simulations which
demonstrate that this process also conserves a mixture of the latter, the
torus-knot angular momentum $J_\gamma$, by producing high-order harmonics with
driving pulses that are invariant under coordinated rotations. We demonstrate
that the charge $J_\gamma$ of the emitted harmonics scales linearly with the
harmonic order, and that this conservation law is imprinted onto the
polarization distribution of the emitted spiral of attosecond pulses. We also
demonstrate how the nonperturbative physics of high-order harmonic generation
affect the torus-knot angular momentum of the harmonics, and we show that this
configuration harnesses the spin selection rules to channel the full yield of
each harmonic into a single mode of controllable orbital angular momentum.

33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org