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- Maldonado, Pablo, et al.
(författare)
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Theory of out-of-equilibrium ultrafast relaxation dynamics in metals
- 2017
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Ingår i: Physical Review B. - 2469-9950 .- 2469-9969. ; 96:17
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Tidskriftsartikel (refereegranskat)abstract
- Ultrafast laser excitation of a metal causes correlated, highly nonequilibrium dynamics of electronic and ionic degrees of freedom, which are, however, only poorly captured by the widely used two-temperature model. Here we develop an out-of-equilibrium theory that captures the full dynamic evolution of the electronic and phononic populations and provides a microscopic description of the transfer of energy delivered optically into electrons to the lattice. All essential nonequilibrium energy processes, such as electron-phonon and phonon-phonon interactions are taken into account. Moreover, as all required quantities are obtained from first-principles calculations, the model gives a realistic and material-dependent description of the relaxation dynamics without the need for fitted parameters. We apply the model to FePt and show that the detailed relaxation is out-of-equilibrium for ps.
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