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When the spatial dimensions of metallic heterostructures shrink below the mean free path of its conduction electrons, the transport of electrons and hence the transport of thermal energy by electrons continuously changes from diffusive to ballistic. Electron–phonon coupling sets the mean free path to the nanoscale and the time for equilibration of electron and lattice temperatures to the picosecond...
In article number 2004555, Matias Bargheer and co‐workers report ultrafast X‐ray diffraction experiments on nanoscale metal heterostructures, which reveal counterintuitive heat transport consistent with heat diffusion including electron‐phonon interaction. The energy deposited in few atomic layers of Pt is transported into a Ni film, which is heated more than the 100 nm Cu film through which the heat...
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