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Resonant X-Ray Emission Spectroscopy with Free Electron Lasers: Nonequilibrium Electron Dynamics in Highly Excited Polar Semiconductors

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Abstract

Resonant x-ray emission spectroscopy with short x-ray pulses from the Linac Coherent Light Source (LCLS) was used to probe the nonequilibrium electron dynamics in highly excited polar semiconductors. In these materials, transient surface-space-charge field screening by the photoexcited carriers (electrons and holes) is expected to launch coherent longitudinal optical phonons which, as a result of the Coulomb coupling between the ionic-atoms and the photoexcited electrons, mix to new coupled phonon-plasmon modes. By tuning the LCLS photon energy to drive a transition between a core level and the conduction band, we observe picosecond (ps) and sub-ps changes on the emission intensity caused by the redistribution and relaxation of the conduction band electrons in the presence of such phonon-plasmon modes. These time dependent changes of the emission intensity reflect directly the evolution of the non-equilibrium electron distribution function.

© 2012 Optical Society of America

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