Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials.

[ 37 ] As there is an increasing trend for κ ∥ with the increased thickness, κ ∥ of 55 nm thick MoS 2 should be larger than 50 and less than 98.5 W m −1 K −1 .

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