Dynamic correlation in high-harmonic generation for helium atoms in intense visible lasers

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dc.creatorMcKenna, G. A.
dc.creatorNepstad, R.
dc.creatorMcCann, J. F.
dc.creatorDundas, D.
dc.date2009-05-20
dc.date.accessioned2026-07-07T13:16:47Z
dc.date.available2026-07-07T13:16:47Z
dc.descriptionWe investigate the effect of dynamic electron correlation on high-harmonic generation in helium atoms using intense visible light (λ=390nm). Two complementary approaches are used which account for correlation in an approximate manner: time-dependent density-functional theory and a single-active-electron model. For intensities I~10^{14} W/cm^2, the theories are in remarkably good agreement for the dynamic polarization and harmonic spectrum. This is attributed to a low-frequency collective mode together with a high-frequency single-electron response due to the nuclear singularity, both of which dominate electron correlation effects. A time-frequency analysis is used to study the timing and emission spectrum of attosecond bursts of light. For short pulses, we find a secondary maximum below the classical cut-off. The imprint of the carrier-envelope-phase, for the time-integrated spectral density appears at frequencies above the high-frequency drop-off, consistent with previous studies in the infrared λ~800nm.
dc.description11 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/0905.3280
dc.identifierhttp://arxiv.org/abs/0905.3280
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230902
dc.subjectQuantum Physics
dc.titleDynamic correlation in high-harmonic generation for helium atoms in intense visible lasers
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