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The relaxation of nonequilibrium heavy-hole distributions in highly polar CdTe is studied via femtosecond transmission spectroscopy and compared to more covalent GaAs. Heavy holes in CdTe show ultrafast energy redistribution via the Frohlich mechanism even if photoexcited below the LO phonon energy. This sub-threshold dynamics is a genuine quantum kinetic effect relevant whenever the polaron self-energy...
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