High harmonic generation in monolayer MoS2 controlled by resonant and near-resonant pulses on ultrashort time scales

Abstract

We report on experimental investigation of nonperturbative high harmonic generation (HHG) in monolayer MoS2 in the ultraviolet spectral region driven by mid-infrared light. We study how the HHG is influenced by pre-excitation of the monolayer using resonant and near-resonant pulses in a pump-probe-like scheme. The resonant light creates high density exciton population. Due to ultrafast dephasing caused by electron-electron scattering, the HHG is suppressed in the presence of pre-excited carriers. In the case of near-resonant excitation with photon energy below the exciton transition, the dynamics of the observed suppression of the HHG yield contains a fast component which is a consequence of momentum scattering at carriers, which are excited by two-photon transition when the two pulses temporally overlap in the sample. This interpretation is supported by comparison of the experimental data with theoretical calculations of two-photon absorption spectrum of MoS2 monolayer. This work demonstrates a possibility to control HHG in lowdimensional materials on ultrashort timescales by combining the driving strong-field pulse with a weak near-resonant light.

arXiv commentAAM; licence: CC BY 4.0; Supplementary_material and data can be found in Ancillary files

References in corpus (18)

• Atomically thin MoS2: A new direct-gap semiconductor
• Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations
• Valley-selective optical Stark effect in monolayer WS2
• High harmonic generation from Bloch electrons in solids
• Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
• Thickness-Dependent Differential Reflectance Spectra of Monolayer and Few-Layer MoS2, MoSe2, WS2 and WSe2
• Micro-reflectance and transmittance spectroscopy: a versatile and powerful tool to characterize 2D materials
• Interband resonant high-harmonic generation by valley polarized electron-hole pairs
• Large, valley-exclusive Bloch-Siegert shift in monolayer WS2
• Tracking ultrafast solid-state dynamics using high harmonic spectroscopy
• Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
• Atomically inspired $k\cdot p$ approach and valley Zeeman effect in transition metal dichalcogenide monolayers
• Control of high-harmonic generation by tuning the electronic structure and carrier injection
• Signatures of multi-band effects in high-harmonic generation in monolayer MoS${}_2$
• Valley-selective optical Stark effect probed by Kerr rotation
• Ultrafast valley-selective coherent optical manipulation with excitons in WSe${}_2$ and MoS${}_2$ monolayers
• Analogy and dissimilarity of excitons in monolayer and bilayer of MoSe${}_2$
• Semiconductor Bloch equation analysis of optical Stark and Bloch-Siegert shifts in monolayers WSe${}_2$ and MoS${}_2$

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