Resonant creation of indirect excitons in diamond at the phonon-assisted absorption edge
Yuji Hazama, N. Naka, Makoto Kuwata‐Gonokami +1 more
We have developed a new scheme for generating cold and high-density excitons in diamond by resonant excitation at the phonon-assisted absorption edge. Both the thermalization of excitons between fine-structure states and the effective temperature are examined with the tuning of the photon energy. The down-conversion rate for the excitons in the fine-structure states is found to be 3.5 ns independent of the photon energy, which means that the lowest-energy dark exciton can be created within a time scale comparable to its lifetime via the generation of a higher-energy bright exciton. With careful choice of excitation photon energy, we have achieved an electron-hole pair density of while maintaining the effective excitonic temperature below 15 K.
Europhysics Letters (EPL)•Nov 1, 2013•11 citations