Lifetimes of excited electrons in Fe and Ni: first-principles GW and the T-matrix theory |
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Authors: | Zhukov V P Chulkov E V Echenique P M |
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Affiliation: | Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain. |
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Abstract: | We present the results of an ab initio calculation of excited electron lifetimes in ferromagnetic materials which incorporates non-spin-flip and spin-flip processes within GW and T-matrix approaches. The method we develop is applied to low-energy electron excitations in Fe and Ni. It is found that the spin-wave generation in Fe essentially reduces the lifetimes of the spin-minority d states whereas the free-electron-like spin-minority states and all the spin-majority states are affected much less. The influence of spin-flip scattering on the lifetimes in Ni appears to be weak. The T-matrix non-spin-flip processes are important for the lifetimes of excited spin-minority states. |
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