  We analyze the effect of electron-phonon coupling on photoemission properties
and ultrafast response of doped monolayer MoS2. The analysis is based on
combined DFT and many-body (Eliashberg theory) approaches. In particular, we
have calculated the electronic and phonon spectra, the electron-phonon coupling
and the electronic spectral function of the system at different values of
doping. We have also analyzed the emissive properties and the response of the
system to femtosecond (fs) laser pulses. It is shown that position of the
emission peak of undoped system is in agreement with the experimental data if
one takes into account the excitonic effects. The results for the self-energy
and spectral functions of the doped systems suggest that one can expect
ultrafast processes to be important in the system response , which makes the
system attractive from the point of view of modern technological applications.
Similar to graphene, the doped system demonstrates ultrafast (fs) relaxation of
the electronic subsystem when excited by fs pulses, and a high ultrafast phonon
relaxation-induced spectral fluence of visible light emission. Together with
high carrier mobility, these features of monolayer MoS2 might be used in modern
optoelectronic technologies.
