Münster 1999 – wissenschaftliches Programm

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O: Oberflächenphysik

O 34: Zeitaufgelöste Spektroskopie

O 34.3: Vortrag

Donnerstag, 25. März 1999, 16:45–17:00, S2

Short-time dynamics of hot electrons at noble- and transition-metal surfaces — •R. Knorren and K.H. Bennemann — Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

The short-time dynamics of the hot-electron distribution at noble- and transition-metal surfaces after optical excitation is calculated in a Boltzmann-equation formalism. The electron–electron scattering rates are determined using Coulomb matrix elements and realistic band structures. We find important contributions from secondary electrons to the observed decay time of the distribution. Particular emphasis is laid on the analysis of spin-dependent relaxation dynamics in ferromagnetic transition metals. Our results are compared with experimental results using the two-photon photoemission technique for Cu [1] and Co [2].

[1] E. Knoesel, A. Hotzel and M. Wolf, Phys. Rev. B 57, 12812 (1998)

[2] M. Aeschlimann, M. Bauer, S. Pawlik, W. Weber, R. Burgermeister, D. Oberli and H.C. Siegmann, PRL 79, 5158 (1997)