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Uncovering extreme nonlinear dynamics in solids through time-domain field analysis

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  • P. D. Keathley, Massachusetts Institute of Technology
  • ,
  • S. V.B. Jensen
  • M. Yeung, Massachusetts Institute of Technology
  • ,
  • M. R. Bionta, Massachusetts Institute of Technology
  • ,
  • L. B. Madsen

We show that time-domain analysis of high harmonic generation from solids with subcycle resolution and broad, continuous spectral coverage is now experimentally viable due to the emergence of sensitive, solid-state optical-field-sampling techniques. With this experimental opportunity in mind, we use time-dependent density functional theory to explore what insights such a time-domain, field-resolved analysis might uncover about the extreme nonlinear electron dynamics responsible for high-harmonic generation (HHG) within solids. We illustrate how simple, visual analysis of the time-domain fields provides clear insight into the interplay between intra- and interband dynamical processes underlying nonlinear light generation when spectral signatures do not. Importantly, we observe conditions where the dominant emission mechanism suddenly switches from intra- to interband over a subcycle region of time within the pulse envelope of the driving wave form. This complex field response means that phase-resolved techniques requiring a certain level of periodicity are, in general, inadequate for the study of HHG from solids. We find that field-resolved measurements having both subcycle time resolution and broad, nearly continuous spectral coverage are required for a general understanding of solid-state HHG.

Original languageEnglish
Article number054302
JournalPhysical Review B
Pages (from-to)1-9
Number of pages9
Publication statusPublished - 1 Feb 2023

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