Abstract
We investigated the formation dynamics of electron-hole droplets in a high-purity single crystal diamond under photoexcitation near the band gap using time-resolved emission spectroscopy. Below the exciton Mott transition density, photogenerated carriers are cooled, and exciton emission appears within 30 ps. A broad emission band of droplets rises slowly, accompanied with a reduction in the exciton emission intensity in the next hundred picoseconds. This spectral change indicates the initial formation of low-temperature supersaturated exciton gas and subsequent spatial condensation of dense exciton gas into electron-hole droplets.
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