Broadband terahertz study of excitonic resonances in the high-density regime in GaAs∕AlxGa1−xAs quantum wells

DOI to cite this document:: 10.5283/epub.19327

Huber, Rupert ; Kaindl, R. A. ; Schmid, B. A. ; Chemla, D. S.

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Date of publication of this fulltext: 01 Feb 2011 11:12

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Abstract

We report the first terahertz study of the intraexcitonic 1s-2p transition at high excitation densities in GaAs∕AlxGa1−xAs 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 ...