Photo-Electronic Optical Nonlinearities In Three- And Quasi Two-Dimensional Semiconductors

We report here on photo-electronic nonlinearities in direct gap seminconductors, especially those connected with the transition from a low-density gas of excitons to an electron-hole plasma. We consider both three-dimensional and quasi two-dimensional semiconductors and compare both systms. Finally we show that these photo-electronic optical non-linearities can be used to obtain various types of optical bistability.

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