Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.33: Poster

Friday, April 4, 2014, 10:30–13:30, P2

Transport effects in metals driven by the nonequilibrium in electron temperatures and chemical potentials — •Linda Thesing, Benedikt Y. Mueller, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany

By exciting a metal sample with an ultrashort laser pulse, not only the electron temperature but also the chemical potential are spatially disturbed. We developed a µ T model for a metallic slab which determines the dynamics of electron and phonon temperatures. In addition, we trace the chemical potential explicitly as an dynamic quantity. Thus, our model allows for additional transport effects, like Seebeck or Peltier effect, which would not be accessible with an ordinary two temperature model (2TM) [1]. The µ T model is based on a reformulation of the 2TM and the heat and particle fluxes are determined by the Boltzmann equation within a relaxation approach. Our model also promises insights in the magnetization dynamics, when spin-up and spin-down electrons are considered separately. Spin-flip scattering processes driven by different chemical potentials [2,3] can then be traced simultaneously with transport effects.

[1] Anisimov et al., Sov. Phys.-JETP 39, 375 (1974)

[2] Mueller et al., PRL 111, 167204 (2013)

[3] Mueller et al., NJP 13, 123010 (2011)