Abstract
Time-resolved two-photon photoemission spectroscopy is used to study ultrafast electron dynamics of epitaxial Cu films grown in situ on a Si(111)-7×7 substrate with 6 to 44 nm thickness. For excitation with femtosecond laser pulses at hν=2.35 eV a pronounced increase of the electron relaxation rates is observed with increasing film thickness and even further in comparison to bulk data. This is attributed to an enhanced energy dissipation in thicker films due to transport of excited carriers into the bulk.
Similar content being viewed by others
References
S.D. Brorson, J.G. Fujimoto, E.P. Ippen: Phys. Rev. Lett. 59, 1962, (1987)
C. Suarez, W.E. Bron, T. Juhasz: Phys. Rev. Lett. 75, 4536, (1995)
J. Hohlfeld, S.S. Wellershoff, J. Güdde, U. Conrad, V. Jähnke, E. Matthias: Chem. Phys. 251, 237, (2000)
J. Cao, Y. Gao, H.E. Elsayed-Ali, R.J.D. Miller, D.A. Mantell: Phys. Rev. B 58, 10948, (1998)
M. Aeschlimann, M. Bauer, S. Pawlik, R. Knorren, G. Bouzerar, K.H. Bennemann: Appl. Phys. A 71, 485, (2000)
E. Knoesel, A. Hotzel, M. Wolf: Phys. Rev. B 57, 12812, (1996)
M. Lisowski, P.A. Loukakos, U. Bovensiepen, J. Stähler, C. Gahl, M. Wolf: Appl. Phys. A 78, 165, (2004)
K. Pedersen, T.B. Kristensen, T.G. Pederser, P. Morgen, Z. Li, S.V. Hoffmann: Phys. Rev. B 66, 153406 (2002)
G. Gubbiotti, G. Carlotti, C. Minarini, S. Loreti, R. Gunnella, M. De Crescenzi: Surf. Sci. 449, 218, (2000)
P.M. Echenique, J.M. Pitarke, E.V. Chulkov, A. Rubio: Chem. Phys. 251, 1, (2000)
R. Knorren, K.H. Bennemann, R. Burgermeister, M. Aeschlimann: Phys. Rev. B 61, 9427, (2000)
Author information
Authors and Affiliations
Corresponding author
Additional information
PACS
73.50.Gr; 73.90.+f; 78.47.+p; 79.60.-i
Rights and permissions
About this article
Cite this article
Lisowski, M., Loukakos, P., Bovensiepen, U. et al. Femtosecond dynamics and transport of optically excited electrons in epitaxial Cu films on Si(111)-7×7. Appl. Phys. A 79, 739–741 (2004). https://doi.org/10.1007/s00339-004-2591-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00339-004-2591-4