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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 12
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Phys. Rev. Lett. 102, 127403 (2009) [4 pages]

Fano Signatures in the Intersubband Terahertz Response of Optically Excited Semiconductor Quantum Wells

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D. Golde1,*, M. Wagner2, D. Stehr2, H. Schneider2, M. Helm2, A. M. Andrews3, T. Roch3, G. Strasser3, M. Kira1, and S. W. Koch1
1Department of Physics and Materials Sciences Center, Philipps-University, Renthof 5, 35032 Marburg, Germany
2Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden, Germany
3Solid State Electronics Institute, Micro- & Nanostructure Center, TU Wien, Floragasse 7, 1040 Vienna, Austria

Received 12 December 2008; published 24 March 2009

Absorption and transmission spectra of broadband terahertz pulses are measured to probe the intersubband response of an optically excited quantum-well heterostructure. While the terahertz absorption shows the single peak of the resonant intersubband transition, the transmission spectra display strong Fano signatures due to the phase sensitive superposition of ponderomotive and terahertz currents as predicted by our microscopic theory.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.127403
DOI:
10.1103/PhysRevLett.102.127403
PACS:
78.67.De, 42.25.Bs, 73.21.Fg

*daniel.golde@physik.uni-marburg.de

 
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