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Photoionization and transient Wannier-Stark ladder in silicon: First-principles simulations versus Keldysh theory
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SYSNO ASEP 0561201 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Photoionization and transient Wannier-Stark ladder in silicon: First-principles simulations versus Keldysh theory Author(s) Derrien, Thibault (FZU-D) ORCID
Tancogne-Dejean, N. (DE)
Zhukov, Vladimir (FZU-D) ORCID
Appel, H. (DE)
Rubio, A. (DE)
Bulgakova, Nadezhda M. (FZU-D) ORCIDNumber of authors 6 Article number L241201 Source Title Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 104, č. 24 (2021)Number of pages 8 s. Language eng - English Country US - United States Keywords nonlinear photoionization ; semiconductors ; Keldysh theory ; TDDFT ; silicon crystal ; ultrashort laser Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects EF15_003/0000445 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF15_006/0000674 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure e-INFRA CZ - 90140 - CESNET, zájmové sdružení právnických osob Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000778835400001 EID SCOPUS 85122042067 DOI 10.1103/PhysRevB.104.L241201 Annotation Nonlinear photoionization of dielectrics and semiconductors is widely treated in the framework of the Keldysh theory whose validity is limited to photon energies that are small compared to the band gap and relatively low laser intensities. The time-dependent density functional theory (TDDFT) simulations, which are free of these limitations, enable one to gain insight into nonequilibrium dynamics of the electronic structure. Here we apply TDDFT to investigate the photoionization of silicon crystal by ultrashort laser pulses in a wide range of laser wavelengths and intensities and compare the results with predictions of the Keldysh theory. Photoionization rates derived from the simulations considerably exceed the data obtained with the Keldysh theory within the validity range of the latter. Possible reasons for the discrepancy are discussed and we provide fundamental data on the photoionization rates beyond the limits of the Keldysh theory.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0333877
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