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, 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.
Keywords
Cite
@article{arxiv.2112.13032,
title = {Signatures of multi-band effects in high-harmonic generation in monolayer MoS$_2$},
author = {Lun Yue and Richard Hollinger and Can B. Uzundal and Bailey Nebgen and Ziyang Gan and Emad Najafidehaghani and Antony George and Christian Spielmann and Daniil Kartashov and Andrey Turchanin and Diana Y. Qiu and Mette B. Gaarde and Michael Zuerch},
journal= {arXiv preprint arXiv:2112.13032},
year = {2022}
}