Optical Properties of MoSe Monolayer Implanted with Ultra-Low-Energy Cr Ions.

This paper explores the optical properties of an exfoliated MoSe monolayer implanted with Cr ions, accelerated to 25 eV. Photoluminescence of the implanted MoSe reveals an emission line from Cr-related defects that is present only under weak electron doping. Unlike band-to-band transition, the Cr-introduced emission is characterized by nonzero activation energy, long lifetimes, and weak response to the magnetic field.