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Quantitative Ultrafast Electron-Temperature Dynamics in Photo-Excited Au Nanoparticles

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arxiv 2107.08782 v1 pith:6TUPOH37 submitted 2021-06-30 cond-mat.mtrl-sci

Quantitative Ultrafast Electron-Temperature Dynamics in Photo-Excited Au Nanoparticles

Maria Sygletou , Stefania Benedetti , Marzia Ferrera , Gian Marco Pierantozzi , Riccardo Cucini , Giuseppe Della Valle , Pietro Carrara , Alessandro De Vita
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Alessandro di Bona Piero Torelli Daniele Catone Giancarlo Panaccione Maurizio Canepa Francesco Bisio
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classification cond-mat.mtrl-sci
keywords nanoparticlesultrafastdynamicsfemtosecondgoldtemperatureapplicationsaround
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The femtosecond evolution of the electronic temperature of laser-excited gold nanoparticles is measured, by means of ultrafast time-resolved photoemission spectroscopy induced by extreme-ultraviolet radiation pulses. The temperature of the electron gas is deduced by recording and fitting high-resolution photo emission spectra around the Fermi edge of gold nanoparticles providing a direct, unambiguous picture of the ultrafast electron-gas dynamics. These results will be instrumental to the refinement of existing models of femtosecond processes in laterally-confined and bulk condensed-matter systems, and for understanding more deeply the role of hot electrons in technological applications.

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