Extended Data Fig. 5: Decay dynamics and pump fluence dependence on ΔR/R.
From: Controllable hydro-thermoelastic heat transport in ultrathin semiconductors at room temperature
a, Temporal dynamics on the suspended region of mono-, bi-, and trilayer MoSe2 flake. As discussed in the main text and in detail in Ref. 21, the signal at Δt < 0 (or Δt = 13 ns) represents the phonon heat accumulated in the system. Thinner flakes show more heat accumulation due to less efficient heat transport to the heat sinks. b–d, The transient reflectivity signals at Δt = 13 ns show a linear dependence with pump fluence for monolayer (b), bilayer (c), and trilayer (d) MoSe2 samples, which makes the transient reflectivity a suitable indicator of the lattice temperature. Error bars represent the standard deviation of the averaged signal before Δt < 0 (Δt = 13 ns).
