Giant excitonic resonance in time-resolved four-wave mixing in quantum wells

Dai-Sik Kim, Jagdeep Shah, J. E. Cunningham, T. C. Damen, Wilfried Schäfer, Michael Hartmann, and Stefan Schmitt-Rink
Phys. Rev. Lett. 68, 1006 – Published 17 February 1992
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Abstract

We report a strong (300:1) excitonic resonance in time-resolved (100 fs) four-wave mixing in GaAs quantum wells as a function of the incident photon energy and show that it results from the large difference in the dephasing rates of excitons and free carriers. We conclude that excitons dominate even when they make up only a small fraction of the excited states. These results, in conjuction with new results in exciton-phonon scattering, provide new insights into previous studies performed with spectrally broad ultrashort pulses.

  • Received 12 December 1991

DOI:https://doi.org/10.1103/PhysRevLett.68.1006

©1992 American Physical Society

Authors & Affiliations

Dai-Sik Kim, Jagdeep Shah, J. E. Cunningham, and T. C. Damen

  • AT&T Bell Laboratories, Holmdel, New Jersey 07733

Wilfried Schäfer and Michael Hartmann

  • Hochstleistungsrechenzentrum Forschungszentrum Jülich, W-5170 Jülich, Federal Republic of Germany

Stefan Schmitt-Rink

  • Department of Physics and Materials Sciences Center, Philipps University, W-3550 Marburg, Federal Republic of Germany

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Issue

Vol. 68, Iss. 7 — 17 February 1992

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