Pulse shape and molecular orientation determine the attosecond charge migration in Caffeine

Thomas A. Niehaus (), Mehdi Meziane, Franck Lepine, Alexandre Marciniak, Kaoru Yamazaki and Hirohiko Kono
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Thomas A. Niehaus: Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
Mehdi Meziane: Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
Franck Lepine: Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
Alexandre Marciniak: Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière
Kaoru Yamazaki: Tohoku University, Institute for Materials Research
Hirohiko Kono: Graduate School of Science, Tohoku University

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 7, 1-7

Abstract: Abstract The recent reduction of laser pulse duration down to the attosecond regime offers unprecedented opportunities to investigate ultrafast changes in the electron density before nuclear motion sets in. Here, we investigate the hole dynamics in the Caffeine molecule that is induced by an ionizing XUV pulse of 6 fs duration using the approximate time-dependent density functional theory method TD-DFTB. In order to account for ionization in a localized atomic orbital basis we apply a complex absorbing potential to model the continuum. Propagation of the time-dependent Kohn–Sham equations allows us to extract the time-dependent hole density taking the pulse shape explicitly into account. Results show that the sudden ionization picture, which is often used to motivate an uncorrelated initial state, fails for realistic pulses. We further find a strong dependence of the hole dynamics on the polarization of the laser field. Notwithstanding, we observe fs charge migration between two distant functional groups in Caffeine even after averaging over the molecular orientation.

Date: 2018
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DOI: 10.1140/epjb/e2018-90223-5

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