Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal control of strong-field ionization with time-dependent
  density-functional theory   We show that quantum optimal control theory (OCT) and time-dependent
density-functional theory (TDDFT) can be combined to provide realistic
femtosecond laser pulses for an enhanced ionization yield in many-electron
systems. Using the H$_2$-molecule as a test case, the optimized laser pulse
from the numerically exact scheme is compared to pulses obtained from OCT+TDDFT
within the TD exact-exchange (TDEXX) and the TD local-density approximation
(TDLDA). We find that the TDDFT-pulses produces an ionization yield of up to
50% when applied to the exact system. In comparison, pulses with a single
frequency but the same fluence typically reach to yields around 5-15%, unless
the frequency is carefully tuned into a Fano-type resonance that leads to $\sim
30%$ yield. On the other hand, optimization within the exact system alone leads
to yields higher than 80%, demonstrating that correlation effects beyond the
TDEXX and TDLDA can give rise to even more efficient ionization mechanisms.

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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg