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- W1968087505 abstract "Time-resolved two-photon photoemission (2PPE) at various photon energies is used to investigate the relaxation dynamics of hot electrons in Cu(111), applying auto- and cross-correlation techniques. The relaxation times vary from 250 fs at 0.1 eV above the Fermi level to 20 fs at 2 eV and show a strong wavelength dependence in the vicinity of the $d$-band feature in the 2PPE spectra. Electrons not directly excited from the $d$ band exhibit a much longer relaxation time than $d$-band electrons excited to the same intermediate-state energy. We attribute these apparently longer lifetimes to a delayed electron generation via Auger decay of $d$-band holes. Based on a band structure calculation, a simulation of the ballistic transport effect and its implication on the observed electron relaxation dynamics is presented for the three low-index copper surfaces. These observations suggest that $d$-band holes have a substantially longer lifetime than excited $mathrm{sp}$-band electrons of the corresponding excitation energy." @default.
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- W1968087505 date "1998-05-15" @default.
- W1968087505 modified "2023-10-11" @default.
- W1968087505 title "Ultrafast dynamics of hot electrons and holes in copper: Excitation, energy relaxation, and transport effects" @default.
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- W1968087505 doi "https://doi.org/10.1103/physrevb.57.12812" @default.
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