Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coulomb Effects on time-trajectory-resolved high-order harmonic
  generation   We study the effect of Coulomb potential on high-order harmonic generation
(HHG) numerically and analytically. We focus on the influence of Coulomb
potential on emission times of HHG associated with specific electron
trajectories. By using a numerical procedure based on numerical solution of
time-dependent Schr\"{o}dinger equation (TDSE) in three dimensions, we extract
the HHG emission times both for long and short electron trajectories. We
compare TDSE predictions with those of a Coulomb-modified model arising from
strong-field approximation (SFA). We show that the Coulomb effect induces
earlier HHG emission times than those predicted by the general SFA model
without considering the Coulomb potential. In particular, this effect
influences differently on long and short electron trajectories and is more
remarkable for low-energy harmonics than high ones. It also changes the HHG
amplitudes for long and short electron trajectories. We validate our
discussions with diverse laser parameters and forms of Coulomb potential. Our
results strongly support a four-step model of HHG.

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The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: math
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc