Phys. Rev. B 77, 153302 (2008) [4 pages]Evidence for nonadiabatic electron-phonon intraband scattering in self-assembled quantum dotsReceived 21 January 2008; published 15 April 2008 Intraconduction band relaxation in n-type InAs/GaAs quantum dots (QDs) for electron transition energies between 124 and 180 meV was investigated by using midinfrared degenerate pump-probe spectroscopy. We find that the intraband electron relaxation after excitation to high energy QD states directly occurs to the QD ground state on a time scale of ∼3–10 ps even in the absence of electron-hole scattering. The electron relaxation time exhibits a relatively weak temperature dependence, which is consistent with multiphonon emission induced by nonadiabatic interaction. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.153302
DOI:
10.1103/PhysRevB.77.153302
PACS:
78.67.Hc
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