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

Rupert Huber; Robert A. Kaindl; Ben A. Schmid; Daniel S. Chemla

doi:10.1103/PhysRevB.72.161314

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

Rupert Huber, Robert A. Kaindl, Ben A. Schmid, Daniel S. Chemla

CLAS-NS: Physics

Research output: Contribution to journal › Article › peer-review

77 Scopus citations

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 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 intraexcitonic resonance.

Original language	English (US)
Article number	161314
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.72.161314
State	Published - Oct 15 2005

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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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 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 intraexcitonic resonance.",

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AU - Huber, Rupert

AU - Kaindl, Robert A.

AU - Schmid, Ben A.

AU - Chemla, Daniel S.

PY - 2005/10/15

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N2 - 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 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 intraexcitonic resonance.

AB - 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 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 intraexcitonic resonance.

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