Polaron decay and inter-level transfer in InAs/GaAs self-assembled quantum dots

摘要

Using energy and temperature dependent far-infrared pump-probe spectrsocopy we demonstrate that polarons in InAs/GaAs quantum dots decay to two equal energy phonons. An additional decay process involving polaron transfer between closely spaced (5meV) excited states has also been observed, for which we find very good agreement between our experimental results and an acoustic phonon assisted transfer model.