Dynamics of the self-energy of the Gd(0001) surface state probed by femtosecond photoemission spectroscopy |
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Authors: | Loukakos P A Lisowski M Bihlmayer G Blügel S Wolf M Bovensiepen U |
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Institution: | Fachbereich Physik, Freie Universit?t Berlin, Arnimallee 14, 14195 Berlin-Dahlem, Germany. |
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Abstract: | Transient changes of the complex self-energy of the 5d(z2) surface state on Gd(0001) after intense optical excitation are investigated by femtosecond time-resolved photoemission. We observe an ultrafast (<100 fs) broadening of the linewidth due to e-e scattering followed by a decrease of the binding energy due to thermal expansion of the lattice. In addition, we resolve a periodic breathing of the band structure which originates from a coherent phonon. An amplitude of 1 pm is derived from the binding energy shift upon lattice displacement calculated by density functional theory. |
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