Resonantly excited high-density exciton gas studiedvia broadbandTHz spectroscopy [electronic resource]
We report the density-dependent crossover of a resonantly photoexcited exciton gas from insulating to conducting phases. Broadband terahertz spectroscopy gives direct access to the exciton binding energy via intra-excitonic 1s-2p transitions. A strong shift, broadening, and ultimately the disappeara...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
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Berkeley, Calif. : Oak Ridge, Tenn. :
Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
2005.
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| Summary: | We report the density-dependent crossover of a resonantly photoexcited exciton gas from insulating to conducting phases. Broadband terahertz spectroscopy gives direct access to the exciton binding energy via intra-excitonic 1s-2p transitions. A strong shift, broadening, and ultimately the disappearance of this resonance occurs with decreasing inter-particle distance. Densities of excitons and unbound electron-hole pairs are followed quantitatively using a model of the composite free-carrier and exciton terahertz conductivity. Comparison with near-infrared absorption changes illustrates a significantly enhanced energy shift and broadening of the intra-excitonic resonance. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 06/25/2005. "lbnl--58474" ": KC0202020" Physical Review B 72 FT. Journal Publication Date: 2005. Chemla, Daniel S.; Kaindl, Robert A.; Huber, Rupert; Schmid, Ben A. USDOE Director. Office of Science. Basic EnergySciences. |