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  Time- and angle-resolved photoelectron spectroscopy of strong-field light-dressed solids: prevalence of the adiabatic band picture

Neufeld, O., Mao, W., Hübener, H., Tancogne-Dejean, N., Sato, S., de Giovannini, U., et al. (2022). Time- and angle-resolved photoelectron spectroscopy of strong-field light-dressed solids: prevalence of the adiabatic band picture.

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2204.14157.pdf (Preprint), 2MB
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https://arxiv.org/abs/2204.14157 (Preprint)
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 Creators:
Neufeld, O.1, 2, Author              
Mao, W.1, 2, Author              
Hübener, H.1, 2, Author              
Tancogne-Dejean, N.1, 2, Author              
Sato, S.1, 2, 3, Author              
de Giovannini, U.1, 2, 4, Author              
Rubio, A.1, 2, 5, Author              
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Free-electron Laser Science, Hamburg, ou_persistent22              
3Center for Computational Sciences, University of Tsukuba, ou_persistent22              
4Università degli Studi di Palermo, Dipartimento di Fisica e Chimica, ou_persistent22              
5Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci, Physics, Optics, physics.optics
 Abstract: In recent years, strong-field physics in condensed-matter was pioneered as a novel approach for controlling material properties through laser-dressing, as well as for ultrafast spectroscopy via nonlinear light-matter interactions (e.g. harmonic generation). A potential controversy arising from these advancements is that it is sometimes vague which band-picture should be used to interpret strong-field experiments: the field-free bands, the adiabatic (instantaneous) field-dressed bands, Floquet bands, or some other intermediate picture. We here try to resolve this issue by performing 'theoretical experiments' of time- and angle-resolved photoelectron spectroscopy (Tr-ARPES) for a strong-field laser-pumped solid, which should give access to the actual observable bands of the irradiated material. To our surprise, we find that the adiabatic band-picture survives quite well, up to high field intensities (~10^12 W/cm^2), and in a wide frequency range (driving wavelengths of 4000 to 800nm, with Keldysh parameters ranging up to ~7). We conclude that to first order, the adiabatic instantaneous bands should be the standard blueprint for interpreting ultrafast electron dynamics in solids when the field is highly off-resonant with characteristic energy scales of the material. We then discuss weaker effects of modifications of the bands beyond this picture that are non-adiabatic, showing that by using bi-chromatic fields the deviations from the standard picture can be probed with enhanced sensitivity. Our work outlines a clear band picture for the physics of strong-field interactions in solids, which should be useful for designing and analyzing strong-field experimental observables and also to formulate simpler semi-empirical models.

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 Dates: 2022-04-29
 Publication Status: Published online
 Pages: 22
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2204.14157
 Degree: -

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