  We report Raman spectra measurements on a MoS2 monolayer supported on SiO2 as
a function of temperature. Unlike in previous studies, the positions of the two
main Raman modes, E2g1 and A1g exhibited nonlinear temperature dependence.
Temperature dependence of phonon shifts and widths is explained by optical
phonon decay process into two acoustic phonons. On the basis of Raman
measurements, local temperature change under laser heating power at different
global temperatures is derived. Obtained results contribute to our
understanding of the thermal properties of two-dimensional atomic crystals and
can help to solve the problem of heat dissipation, which is crucial for use in
the next generation of nanoelectronic devices.
