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Article overview
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Optimal control of strong-field ionization with time-dependent density-functional theory | | M. Hellgren
; E. Rasanen
; E.K.U. Gross
; | | Date: |
3 Sep 2013 | | Abstract: | 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. | | Source: | arXiv, 1309.0786 | | Services: | Forum | Review | PDF | Favorites | |
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