Acoustic Vibration Modes and Electron–Lattice Coupling in Self-Assembled Silver Nanocolumns

Julien Burgin (1) , P. Langot (1) , Arnaud Arbouet (2, 3) , Jeremie Margueritat (2, 3, 4) , J. Gonzalo (4) , C.N. Afonso (4) , F. Vallée (5) , Adnen Mlayah (2, 3) , M.D. Rosell (6) , G. van Tendeloo (6)

1 CPMOH - Centre de physique moléculaire optique et hertzienne
2 Laboratoire Physique des Solides de Toulouse
3 CEMES - Centre d'élaboration de matériaux et d'études structurales
4 IO - Instituto de Optica
5 LASIM - Laboratoire de Spectrométrie Ionique et Moléculaire
6 EMAT - Electron Microscopy for Material Resaerch (EMAT)

Using ultrafast spectroscopy, we investigated electron–lattice coupling and acoustic vibrations in self-assembled silver nanocolumns embedded in an amorphous Al2O3 matrix. The measured electron–lattice energy exchange time is smaller in the nanocolumns than in bulk silver, with a value very close to that of isolated nanospheres with comparable surface to volume ratio. Two vibration modes were detected and ascribed to the breathing and extensional mode of the nanocolumns, in agreement with numerical simulations

Domaines: Autre [cond-mat.other]

Julien Burgin, P. Langot, Arnaud Arbouet, Jeremie Margueritat, J. Gonzalo, et al.. Acoustic Vibration Modes and Electron–Lattice Coupling in Self-Assembled Silver Nanocolumns. Nano Letters, 2008, 8, pp.1296. ⟨10.1021/nl073123r⟩. ⟨hal-00338814⟩