Conference on Lasers and Electro-Optics, 2021
DOI: 10.1364/cleo_qels.2021.ftu1l.3
High harmonic generation (HHG) in a single-atomic-layer non-centrosymmetric semiconductor is investigated experimentally for different driving laser field polarizations. The ellipticity enhanced even-order HHG for certain crystal orientations reveals linked laser and valley polarizations.