期刊
APPLIED PHYSICS LETTERS
卷 113, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5030895
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资金
- Polish National Science Centre [2014/14/M/ST3/ 00821, 2011/02/A/ST3/00152]
- Foundation for Polish Science within START fellowship
- State of Bavaria in Germany
We report on strongly temperature-dependent kinetics of negatively charged carrier complexes in asymmetric InAs/AlGaInAs/InP quantum dots (dashes) emitting at telecom wavelengths. The structures are highly elongated and of large volume, which results in atypical carrier confinement characteristics with s-p shell energy splittings far below the optical phonon energy, which strongly affects the phonon-assisted relaxation. Probing the emission kinetics with time-resolved microphotoluminescence from a single dot, we observe a strongly non-monotonic temperature dependence of the charged exciton lifetime. Using a kinetic rate-equation model, we find that a relaxation sidepath through the excited charged exciton triplet states may lead to such behavior. This, however, involves efficient singlet-triplet relaxation via the electron spin-flip. Thus, we interpret the results as an indirect observation of strongly enhanced electron spin relaxation without a magnetic field, possibly resulting from atypical confinement characteristics. Published by AIP Publishing.
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