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The thermal dynamics induced by ultrashort laser pulses in nanoscale systems,i.e. all-optical time-resolved nanocalorimetry is theoretically investigatedfrom 300 to 1.5 K. We report ab-initio calculations describing the temperaturedependence of the electron-phonon interactions for Cu nanodisks supported onSi. The electrons and phonons temperatures are found to decouple on the ns timescale at 10 K, which is two orders of magnitude in excess with respect to thatfound for standard low-temperature transport experiments. By accounting for thephysics behind our results we suggest an alternative route for overhauling thepresent knowledge of the electron-phonon decoupling mechanism in nanoscalesystems by replacing the mK temperature requirements of conventionalexperiments with experiments in the time-domain.

physical review. b, condensed matter and materials physics

Ab-initio calculation of all-optical time-resolved calorimetry of  nanosized systems: Evidence of nanosecond-decoupling of electron and phonon  temperatures