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Monolayer films of transition metal dichalcogenides (in particular, MoS2,MoSe2, WS2, and WSe2) can be considered as ideal systems for the studies ofhigh-temperature electron-hole liquids. The quasi-two-dimensional nature ofelectrons and holes ensures their stronger interaction as compared to that inbulk semiconductors. The screening of the Coulomb interaction in monolayerheterostructures is significantly reduced, since it is determined by thepermittivities of the environment (e.g., vacuum and substrate), which are muchlower than those characteristic of the films of transition metaldichalcogenides. The multivalley structure of the energy spectrum of chargecarriers in transition metal dichalcogenides significantly reduces the kineticenergy, resulting in the increase in the equilibrium density and binding energyof the electron-hole liquid. The binding energy of the electron-hole liquid andits equilibrium density are determined. It is shown that the two-dimensionalCoulomb potential should be used in the calculations for the electron-holeliquid.

Electron-Hole Liquid in Monolayer Transition Metal Dichalcogenide Heterostructures