Fano profile in the intersubband terahertz response of photoexcited GaAs/AlGaAs quantum wells

In our work we probe the conduction intersubband transition of an undoped GaAs/Al0.34Ga0.66As multiple quantum well via broadband terahertz pulses after resonant photoexcitation at the 1s heavy-hole exciton. The pump-induced change in the transmitted terahertz field shows a strong beating. In the fr...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-11, Vol.193 (1), p.012073
Main Authors: Wagner, M, Golde, D, Stehr, D, Schneider, H, Helm, M, Andrews, A M, Roch, T, Strasser, G, Kira, M, Koch, S W
Format: Article
Language:English
Subjects:
Broadband
Excitons
Gallium arsenide
Intersubband transitions
Line shape
Photoexcitation
Physics
Quantum wells
Terahertz frequencies
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Summary:In our work we probe the conduction intersubband transition of an undoped GaAs/Al0.34Ga0.66As multiple quantum well via broadband terahertz pulses after resonant photoexcitation at the 1s heavy-hole exciton. The pump-induced change in the transmitted terahertz field shows a strong beating. In the frequency domain this results in an asymmetric Fano-like line shape for the intersubband resonance and an additional broad low-frequency peak. However, the total THz absorption shows only the single symmetric peak of the intersubband transition. In our microscopic theory these signatures unambiguously originate from the phase sensitive superposition of ponderomotive and terahertz intersubband currents.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/193/1/012073