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  5. Ultrafast thermoelectric properties of gold under conditions of strong electron-phonon nonequilibrium

Ultrafast thermoelectric properties of gold under conditions of strong electron-phonon nonequilibrium

File(s)
JApplPhys_108_104907.pdf (195.55 KB)
journal article
Permanent Link(s)
https://hdl.handle.net/1813/33260
Collections
Cornell NanoScale Facility Papers, Research and Monographs
Author
Hopkins, Patrick
Bauer, Matthew
Duda, John
Smoyer, Justin
English, Timothy
Norris, Pamela
Beechem, Thomas
Stewart, Derek
Abstract

The electronic scattering rates in metals after ultrashort pulsed laser heating can be drastically different than those predicted from free electron theory. The large electron temperature achieved after ultrashort pulsed absorption and subsequent thermalization can lead to excitation of subconduction band thermal excitations of electron orbitals far below the Fermi energy. In the case of noble metals, which all have a characteristic flat d-band several electron volts well below the Fermi energy, the onset of d-band excitations has been shown to increase electron-phonon scattering rates by an order of magnitude. In this paper, we investigate the effects of these large electronic thermal excitations on the ultrafast thermoelectric transport properties of gold, a characteristic noble metal. Under conditions of strong electron-phonon nonequilibrium (relatively high electron temperatures and relatively low lattice temperatures, T_{e} >> T_{L}), we find that the Wiedemann–Franz law breaks down and the Seebeck coefficient is massively enhanced. Although we perform representative calculations for Au, these results are expected to be similar for the other noble metals (Ag and Cu) due to the characteristic large d-band separation from the Fermi energy.

Date Issued
2010-11-23
Publisher
American Institute of Physics (AIP)
Keywords
thermoelectric
•
ultrafast
•
weidemann-franz law
•
seebeck
•
lorentz number
•
laser
•
density functional theory
•
density of states
Previously Published as
P. E. Hopkins, M. L. Bauer, J. C. Duda, J. L. Smoyer, T. S. English, P. M. Norris, T. E. Beechem, and D. A. Stewart, J. Appl. Phys., 108, 104907 (2010)
Type
article

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