Abstract
With the advent of femtosecond lasers has come the promise of directly measuring ultrafast electron transport effects in electronic materials and devices. Using a front pump/back probe1 measurement of transient reflectivity changes, we have observed ultrafast electronic heat transport through thin films of gold. For film thicknesses of 500 – 2000 A, we find thermal transport occurs on a timescale of 40 – 200 fs. In this regime, the transport of heat seems to be governed by nonequilibrium electronic motion, since equilibrium heat diffusion occurs over tens of picoseconds.
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