Signatures of multi-band effects in high-harmonic generation in monolayer MoS${}_2$

Abstract

High-harmonic generation (HHG) in solids has been touted as a way to probe ultrafast dynamics and crystal symmetries in condensed matter systems. Here, we investigate the polarization properties of high-order harmonics generated in monolayer MoS${}_2$, as a function of crystal orientation relative to the mid-infrared laser field polarization. At several different laser wavelengths we experimentally observe a prominent angular shift of the parallel-polarized odd harmonics for energies above approximately 3.5 eV, and our calculations indicate that this shift originates in subtle differences in the recombination dipole strengths involving multiple conduction bands. This observation is material specific and is in addition to the angular dependence imposed by the dynamical symmetry properties of the crystal interacting with the laser field, and may pave the way for probing the vectorial character of multi-band recombination dipoles.

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Cited by in corpus (9)

• Are there universal signatures of topological phases in high harmonic generation? Probably not
• Characterizing Anomalous High-Harmonic Generation in Solids
• High harmonic generation in monolayer MoS2 controlled by resonant and near-resonant pulses on ultrashort time scales
• Floquet theory and computational method for the optical absorption of laser-dressed solids
• A solid-state high harmonic generation spectrometer with cryogenic cooling
• Ultrafast Coherent Bandgap Modulation Probed by Parametric Nonlinear Optics
• Theoretical study of high harmonic generation in monolayer NbSe${}_2$
• Orbital magnetization reveals multiband topology
• Revealing the anisotropic charge-density-wave order of TiSe${}_2$ through high harmonic generation