Ultrafast quasiparticle relaxation dynamics in normal metals and heavy fermion materials

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dc.creatorAhn, K. H.
dc.creatorGraf, M. J.
dc.creatorTrugman, S. A.
dc.creatorDemsar, J.
dc.creatorAveritt, R. D.
dc.creatorSarrao, J. L.
dc.creatorTaylor, A. J.
dc.date2003-08-11
dc.date2004-02-18
dc.date.accessioned2026-07-07T02:52:53Z
dc.date.available2026-07-07T02:52:53Z
dc.descriptionWe present a detailed theoretical study of the ultrafast quasiparticle relaxation dynamics observed in normal metals and heavy fermion materials with femtosecond time-resolved optical pump-probe spectroscopy. For normal metals, a nonthermal electron distribution gives rise to a temperature (T) independent electron-phonon relaxation time at low temperatures, in contrast to the T^{-3}-divergent behavior predicted by the two-temperature model. For heavy fermion compounds, we find that the blocking of electron-phonon scattering for heavy electrons within the density-of-states peak near the Fermi energy is crucial to explain the rapid increase of the electron-phonon relaxation time below the Kondo temperature. We propose the hypothesis that the slower Fermi velocity compared to the sound velocity provides a natural blocking mechanism due to energy and momentum conservation laws.
dc.description10 pages, 11 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0308213
dc.identifierhttp://arxiv.org/abs/cond-mat/0308213
dc.identifierPhys. Rev. B 69, 045114 (2004)
dc.identifierdoi:10.1103/PhysRevB.69.045114
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22008
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleUltrafast quasiparticle relaxation dynamics in normal metals and heavy fermion materials
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