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Phys. Rev. Lett. 96, 255003 (2006) [4 pages]

Broadband Dielectric Function of Nonequilibrium Warm Dense Gold

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Y. Ping1, D. Hanson2, I. Koslow2, T. Ogitsu1, D. Prendergast1, E. Schwegler1, G. Collins1, and A. Ng1,2
1Lawrence Livermore National Laboratory, Livermore, California, USA
2Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada

Received 15 May 2006; published 26 June 2006

We report on the first single-state measurement of the broadband (450–800 nm) dielectric function of gold isochorically heated by a femtosecond laser pulse to energy densities of 106-107  J/kg. A Drude and an interband component are clearly seen in the imaginary part of the dielectric function. The Drude component increases with energy density while the interband component shows both enhancement and redshift. This is in strong disagreement with predictions of a recent calculation of dielectric function based on limited Brillouin zone sampling.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.255003
DOI:
10.1103/PhysRevLett.96.255003
PACS:
52.50.Jm, 52.25.Fi, 52.25.Os, 52.38.−r
 
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