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

Francesco Banfi, Claudio Giannetti, Gabriele Ferrini, Bernard Revaz, Damiano Nardi, Fulvio Parmigiani, Federico Pressacco

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

19 Citazioni (Scopus)

Abstract

The thermal dynamics induced by ultrashort laser pulses in nanoscale systems, i.e., all-optical time resolved nanocalorimetry is theoretically investigated from 300 to 1.5 K. We report ab initio calculations describing the temperature dependence of the electron-phonon interactions for Cu nanodisks supported on Si. The electrons and phonons temperatures are found to decouple on the ns time scale at ∼10 K, which is two orders of magnitude in excess with respect to that found for standard low-temperature transport experiments. By accounting for the physics behind our results we suggest an alternative route for overhauling the present knowledge of the electron-phonon decoupling mechanism in nanoscale systems by replacing the mK temperature requirements of conventional experiments with experiments in the time domain.
Lingua originaleEnglish
pagine (da-a)N/A-N/A
Numero di pagine155426
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume81
DOI
Stato di pubblicazionePubblicato - 2010

Keywords

  • nanocalorimetry
  • nanostructures
  • ultrafast lasers

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