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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Transient gain enhancement in photorefractive crystals with two types of movable charge carrier

A Shumelyuk1, A Hryhorashchuk, S Odoulov

  • 1Institute of Physics, National Academy of Sciences, 46, Science Avenue, Ukraine. shumeluk@iop.kiev.ua

Optics Letters
|July 17, 2007
PubMed

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Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...