One- and two-phonon capture processes in quantum dots

Multiphonon capture processes are investigated theoretically and found to contribute efficiently to the carrier injection into quantum dots. It is shown that two-phonon capture contributes where single-phonon capture is energetically inhibited and can lead to electron capture times of a few picoseconds at room temperature and carrier densities of ${10}^{17}$ ${\mathrm{cm}}^{\text{−3}}$ in the barrier.