Direct Measurement of Ballistic and Diffusive Electron Transport in Gold.
Nano Lett
; 23(2): 491-496, 2023 Jan 25.
Article
em En
| MEDLINE
| ID: mdl-36598434
ABSTRACT
We experimentally show that the ballistic length of hot electrons in laser-heated gold films can exceed â¼150 nm, which is â¼50% greater than the previously reported value of 100 nm inferred from pump-probe experiments. We also find that the mean free path of electrons at the peak temperature following interband excitation can reach upward of â¼45 nm, which is higher than the average value of 30 nm predicted from our parameter-free density functional perturbation theory. Our first-principles calculations of electron-phonon coupling reveal that the increase in the mean free path due to interband excitation is a consequence of drastically reduced electron-phonon coupling from lattice stiffening, thus providing the microscopic understanding of our experimental findings.
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Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article