Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-08-11
Phys. Rev. B 69, 045114 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 11 figures
Scientific paper
10.1103/PhysRevB.69.045114
We 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.
Ahn Kang-Hun
Averitt Richard D.
Demsar Jure
Graf Matthias. J.
Sarrao John L.
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