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Resonantly excited high-density exciton gas studiedvia broadbandTHz spectroscopy
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.
Date:
June 25, 2005
Creator:
Huber, Rupert; Kaindl, Robert A.; Schmid, Ben A. & Chemla, Daniel S.
System:
The UNT Digital Library
2005 Atomic Physics Gordon Conference, June 26-July 1, 2005
This article is a detailed description of the Gordon Research Conference on Atomic Physics.
Date:
June 25, 2005
Creator:
Monroe, Christopher
System:
The UNT Digital Library