Broadband THz study of excitonic resonances in the high-density regime

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We report the first terahertz study of the intra-excitonic 1s-2p transition at high excitation densities in GaAs/AlGaAs quantum wells. A strong shift, broadening, and ultimately the disappearance of this resonance occurs with increasing density, after ultrafast photoexcitation at the near-infrared exciton line. Densities of excitons and unbound electron-hole pairs are followed quantitatively using a model of the composite terahertz dielectric response. Comparison with near-infrared absorption changes reveals a significantly enhanced energy shift and broadening of the intra-excitonic resonance.
4 pages, 4 figures

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Mesoscale and Nanoscale Physics, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/95766

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0508082
 http://arxiv.org/abs/cond-mat/0508082
 Phys. Rev. B 72, 161314(R) (2005)
 doi:10.1103/PhysRevB.72.161314

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arXiv