Control of condensation and evaporation of electron-hole liquid in diamond by femtosecond laser pulses
Abstract
We demonstrate the ultrafast control of condensation and evaporation of an electron-hole liquid in diamond prepared by chemical vapor deposition. The electron-hole liquid dynamics was measured using a three-pulse pump and probe experiment.
The transient transmission changes in the presence of electron-hole drops were assigned to the increase in the Drude scattering rate in the model of free carrier absorption due to a high carrier density. The fast (similar to 1 ps) liquid evaporation was induced by infrared femtosecond pulses and its dynamics was investigated under different photon energies and fluences.
The value of the electron-hole liquid binding energy per electron-hole pair 80 +/- 40 meV determined from the measured transient transmission signal agrees well with previously published values. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim