Femtosecond dynamics of hot electrons at clean Cu(110) and Cu(100) surfaces

Susumu Ogawa; Hrvoje Petek

doi:10.1117/12.221465

25 September 1995 Femtosecond dynamics of hot electrons at clean Cu(110) and Cu(100) surfaces

Susumu Ogawa, Hrvoje Petek

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221465
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Hot-electron thermalization by electron-electron scattering is measured by two-photon photoemission spectroscopy at clean Cu(110) and Cu(100) surfaces. Two-photon photoemission spectra are measured as a function crystal face, laser polarization, and photon energy to establish the excitation mechanism. Time-resolved measurements of hot-electrons dynamics using approximately 3.2 eV femtosecond laser excitation light show a two- component decay due to dephasing and population relaxation dynamics. Hot-electron lifetimes in the 1.3 - 3.3 eV energy range decrease from approximately 80 fs to approximately 15 fs as the energy is increased. Energy dependence of the population decay rate is approximately 6.5 times slower than predicted by the Fermi liquid theory and shows a modest dependence on the Cu crystal face. Observation of hot-electron coherence on <EQ 15 fs time scale opens the way for coherent control of hot-electron induced dynamics at metal interfaces by ultrafast lasers.

Citation Download Citation

Susumu Ogawa and Hrvoje Petek "Femtosecond dynamics of hot electrons at clean Cu(110) and Cu(100) surfaces", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221465

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