  Photo-excited electrons and holes in insulators, above a critical density and
below a critical temperature, can condense to form an electron-hole liquid
(EHL) phase. However, observing the EHL phase at room temperature is extremely
challenging. Here, we introduce the monolayer MoSi$_2$Z$_4$ (Z= N, As, P)
series of compounds as a promising platform for observing the EHL phase at room
temperature. The higher impact of the Coulomb interactions in two dimensions
helps these monolayers support the EHL phase with an increased EHL binding
energy and transition temperature, along with strongly bound excitons. Our
findings motivate further exploration of the MoSi$_2$Z$_4$ monolayers for
realizing the EHL phase at high temperatures to harness collective phenomena
for optoelectronic applications.
