Document Type
Article
Publication Date
9-30-2022
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 MoS2, 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 multiband recombination dipoles.
Publication Source (Journal or Book title)
Physical Review Letters
Recommended Citation
Yue, L., Hollinger, R., Uzundal, C., Nebgen, B., Gan, Z., Najafidehaghani, E., George, A., Spielmann, C., Kartashov, D., Turchanin, A., Qiu, D., Gaarde, M., & Zuerch, M. (2022). Signatures of Multiband Effects in High-Harmonic Generation in Monolayer MoS2. Physical Review Letters, 129 (14) https://doi.org/10.1103/PhysRevLett.129.147401