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20 April 2024

» pubmed » pmid17359194

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Dynamics of the self-energy of the Gd(0001) surface state probed by femtosecond photoemission spectroscopy
P A Loukakos ; M Lisowski ; G Bihlmayer ; S Blügel ; M Wolf ; U Bovensiepen ;
Date:	2 Mar 2007
Journal:	Phys Rev Lett, 98 (9), 097401
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.
Source:	PubMed, pmid17359194
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