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Coulomb enhancement of high harmonic generation in monolayer transition metal dichalcogenides
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DOI：10.1364/OL.485551.png)
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Abstract
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High harmonic generation (HHG) in monolayer MoS2 is studied using fully microscopic many-body models based on the semiconductor Bloch equations and density func-tional theory. It is shown that Coulomb correlations lead to a dramatic enhancement of HHG. In particular, near the bandgap, enhancements of two orders of magnitude or more are observed for a wide range of excitation wavelengths and intensities. For excitation at excitonic resonances, strong absorption leads to spectrally broad sub-floors of the har-monics that is absent without Coulomb interaction. The widths of these sub-floors depend strongly on the dephas-ing time for polarizations. For times of the order of 10 fs the broadenings are comparable to the Rabi energies and reach one electronvolt at fields of approximately 50 MV/cm. The intensities of these contributions are approximately four to six orders below the peaks of the harmonics. (c) 2023 Optica Publishing Group
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