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Recent core-hole-clock experiments [Phys. Rev. Lett. $\textbf{112}$, 086801(2014)] showed that the spin dependence of electron injection times atAr/Co(0001) and Ar/Fe(110) interfaces is at variance with the expectationsbased on previous calculations for related systems. Here we reconcile theoryand experiment, and demonstrate that the observed dependence is rooted in thedetails of the spin-split surface band structures. Our ab initio calculationsback that minority electrons are injected significantly faster than majorityelectrons in line with the experimentally reported ultrashort injection times.The dynamics is particularly sensitive to the size (in reciprocal-space) of theprojected band gaps around $\overline{\Gamma}$ for both substrates at theresonance energies. A simple tunneling model incorporating the spin-dependentgap sizes further supports these findings.

Theory of Spin-Dependent Electron Transfer Dynamics at Ar/Co(0001) and Ar/Fe(110) Interfaces