Towards strong field Valley polarization with Trefoil fields

Abstract

We tailor mid-IR light fields on their sub-cycle optical scale as trefoil fields to control valley polarization in hexagonal materials.

Symmetries and correlations in solids probed by ultrafast high-harmonic spectroscopy

“…By using of-resonant excitation in 2H-MoS 2 , a modulation of the band gap at the high symmetry points +K and -K has been shown in Refs. [348,349]. Here, the threefold field matches the trigonal crystal structure of 2H-MoS 2 and selectively drives electrons along the crystal directions as depicted in Fig.…”