Dielectric electron-hole liquid in monolayer heterostructures based on transition metal dichalcogenides

The possibility of the appearance of a dielectric electron-hole liquid (EHL) in monolayers of transition metal dichalcogenides and heterostructures based on them is considered. It is shown that the coherent pairing of electrons and holes in them leads to the formation of a dielectric EHL when the degree of circular polarization of the exciting light exceeds a certain threshold value. Below this value, a metallic EHL is realized. Some possible physical manifestations of the transition between these two types of EHL are noted.