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Thermodynamics and transport properties in the transient regime

Hüttner, Bernd (1999) Thermodynamics and transport properties in the transient regime. Journal of Physics - Condensed Matter, 11, pp. 6757-6777. IOP Publishing Ltd.

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Abstract

The nonequilibrium behaviour in the transient regime of metals excited by ultrashort optical pulses is investigated by means of a second order expansion of the Boltzmann equation. By definition, the transition range is located between the time necessary for the establishment of the electron temperature and the time where a description by the standard steady state equations is justified. Relaxation functions are derived for the electrical and thermal currents, and the relaxation times related to them are determined. It is shown that for the electrical transport the relaxation time corre-sponds to Drude's momentum scattering time whereas the corresponding time for the heat flow is identified as the electron temperature relaxation time. Further, expressions for the electrical and thermal conductivity are obtained in the case of a local thermal nonequilibrium between the electron and phonon subsystems in first and second order, respectively. Consequences for the determination of the temperature distributions inside metals are discussed. The solution of the Boltzmann equation is also used for the calculation of the time dependent energy distribution function of the electrons. The results are in good agreement with the experiment.

Document Type:Article
Title:Thermodynamics and transport properties in the transient regime
Authors:
AuthorsInstitution or Email of Authors
Hüttner, BerndUNSPECIFIED
Date:1999
Journal or Publication Title:Journal of Physics - Condensed Matter
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:11
Page Range:pp. 6757-6777
Publisher:IOP Publishing Ltd
Status:Published
Keywords:thermodynamics, nonequilibrium, short time physics, electron distribution, relaxation time, thermal conductivity, electron and phonon temperature, Boltzmann equation, Wiedemann-Franz law
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Dr.rer.nat. Bernd Hüttner
Deposited On:09 Feb 2006
Last Modified:14 Jan 2010 20:53

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