https://doi.org/10.1140/epjp/s13360-023-04653-3
Regular Article
Exploring key factors influencing high harmonic generation in monolayer WS2: insights from semi-conductor Bloch equations based on Haldane's model
1
Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
2
Institute of Condensed Matter Theory and Optics, Friedrich-Schiller-University Jena, 07743, Jena, Germany
Received:
20
May
2023
Accepted:
1
November
2023
Published online:
14
November
2023
This study investigates the high-order harmonic generation of the monolayer WS2 using semi-conductor Bloch equations within the framework of Haldane's model. Cutoff energy’s dependence on the strength of the laser field is investigated. We show that the cutoff harmonic order extends linearly with increased electric field strength in both trivial and non-trivial phases. Moreover, the dependence of the harmonic yield on the ellipticity, as well as the wavelength of the driving laser pulse, is studied. The examination of the ellipticity's impact on the yield reveals that the maximum yield is achieved when the laser polarization is either linear or circular. The dependence of the total yield on the laser wavelength demonstrates that the total yield scales as λ−4.5. Furthermore, we show that investigating the density of excited electrons and the trajectory of charge carriers helps validate our findings. We also employ time–frequency profiling to uncover additional insights from our results.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.